diff --git a/.gitsplit.yml b/.gitsplit.yml
index 9f7eb8289..95c7a4a25 100644
--- a/.gitsplit.yml
+++ b/.gitsplit.yml
@@ -10,6 +10,8 @@ splits:
     target: "https://${GH_TOKEN}@github.com/opentelemetry-php/gen-otlp-protobuf.git"
   - prefix: "src/Context"
     target: "https://${GH_TOKEN}@github.com/opentelemetry-php/context.git"
+  - prefix: "src/Config/Configuration"
+    target: "https://${GH_TOKEN}@github.com/opentelemetry-php/config.git"
   - prefix: "src/SemConv"
     target: "https://${GH_TOKEN}@github.com/opentelemetry-php/sem-conv.git"
   - prefix: "src/API"
diff --git a/composer.json b/composer.json
index 4bb3abee2..780ae0245 100644
--- a/composer.json
+++ b/composer.json
@@ -37,6 +37,7 @@
     ],
     "replace": {
         "open-telemetry/api": "1.0.x-dev",
+        "open-telemetry/config": "1.0.x-dev",
         "open-telemetry/context": "1.0.x-dev",
         "open-telemetry/exporter-otlp": "1.0.x-dev",
         "open-telemetry/exporter-zipkin": "1.0.x-dev",
diff --git a/deptrac.yaml b/deptrac.yaml
index 8507328db..fcbbc3133 100644
--- a/deptrac.yaml
+++ b/deptrac.yaml
@@ -25,6 +25,14 @@ deptrac:
           collectors:
               -   type: directory
                   value: src/SDK/.*
+      -   name: Config
+          collectors:
+              - type: directory
+                value: src/Config/Configuration/.*
+      -   name: ConfigSDK
+          collectors:
+              - type: directory
+                value: src/Config/SDK/.*
       -   name: Context
           collectors:
               -   type: directory
@@ -77,12 +85,22 @@ deptrac:
           collectors:
               - type: className
                 regex: ^Composer\\*
+      -   name: SymfonyConfig
+          collectors:
+              - type: className
+                regex: ^Symfony\\Component\\*
+      -   name: SPI
+          collectors:
+              - type: className
+                regex: ^Nevay\\SPI\\*
 
     ruleset:
       Context:
           - FFI
+          - Config
       SemConv: ~
       API:
+          - Config
           - Context
           - PsrLog
       SDK:
@@ -91,6 +109,15 @@ deptrac:
           - PsrHttp
           - HttpPlug
           - Composer
+      Config:
+          - PsrLog
+      ConfigSDK:
+          - Contrib
+          - Extension
+          - PsrLog
+          - SymfonyConfig
+          - +SDK
+          - SPI
       Contrib:
           - +SDK
           - +OtelProto
@@ -101,3 +128,4 @@ deptrac:
       OtelProto:
           - GoogleProtobuf
           - Grpc
+      SdkConfig:
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 74b2971a2..6507b01ed 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -13,11 +13,6 @@ parameters:
         - tests/TraceContext/W3CTestService
         - tests/Unit/Config/SDK/Configuration/ExampleSdk
     ignoreErrors:
-        -
-            message: "#Call to an undefined method .*#"
-            paths:
-                - tests/Unit/SDK/Common/Configuration/Resolver/PhpIniResolverTest.php
-                - tests/Unit/SDK/Common/Configuration/Resolver/CompositeResolverTest.php
         -
             message: "#Call to an undefined method .*:allows.*#"
             paths:
diff --git a/src/API/Behavior/Internal/LogWriterFactory.php b/src/API/Behavior/Internal/LogWriterFactory.php
index 5bf5a3af2..c0435be2f 100644
--- a/src/API/Behavior/Internal/LogWriterFactory.php
+++ b/src/API/Behavior/Internal/LogWriterFactory.php
@@ -9,26 +9,26 @@
 use OpenTelemetry\API\Behavior\Internal\LogWriter\NoopLogWriter;
 use OpenTelemetry\API\Behavior\Internal\LogWriter\Psr3LogWriter;
 use OpenTelemetry\API\Behavior\Internal\LogWriter\StreamLogWriter;
-use OpenTelemetry\API\Instrumentation\ConfigurationResolver;
 use OpenTelemetry\API\LoggerHolder;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 
 class LogWriterFactory
 {
-    private const OTEL_PHP_LOG_DESTINATION = 'OTEL_PHP_LOG_DESTINATION';
-
     public function create(): LogWriterInterface
     {
-        $dest = (new ConfigurationResolver())->getString(self::OTEL_PHP_LOG_DESTINATION);
+        $dest = (new Configuration())->getEnum(Variables::OTEL_PHP_LOG_DESTINATION);
         $logger = LoggerHolder::get();
 
         switch ($dest) {
-            case 'none':
+            case KnownValues::VALUE_NONE:
                 return new NoopLogWriter();
-            case 'stderr':
+            case KnownValues::VALUE_STDERR:
                 return new StreamLogWriter('php://stderr');
-            case 'stdout':
+            case KnownValues::VALUE_STDOUT:
                 return new StreamLogWriter('php://stdout');
-            case 'psr3':
+            case KnownValues::VALUE_PSR3:
                 if ($logger) {
                     return new Psr3LogWriter($logger);
                 }
@@ -36,7 +36,7 @@ public function create(): LogWriterInterface
 
                 //default to error log
                 return new ErrorLogWriter();
-            case 'error_log':
+            case KnownValues::VALUE_ERROR_LOG:
                 return new ErrorLogWriter();
             default:
                 if ($logger) {
diff --git a/src/API/Behavior/Internal/Logging.php b/src/API/Behavior/Internal/Logging.php
index e5bec7ab5..47e13bdc9 100644
--- a/src/API/Behavior/Internal/Logging.php
+++ b/src/API/Behavior/Internal/Logging.php
@@ -5,6 +5,8 @@
 namespace OpenTelemetry\API\Behavior\Internal;
 
 use OpenTelemetry\API\Behavior\Internal\LogWriter\LogWriterInterface;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use Psr\Log\LogLevel;
 
 /**
@@ -69,15 +71,7 @@ public static function logLevel(): int
 
     private static function getLogLevel(): int
     {
-        $level = array_key_exists(self::OTEL_LOG_LEVEL, $_SERVER)
-            ? $_SERVER[self::OTEL_LOG_LEVEL]
-            : getenv(self::OTEL_LOG_LEVEL);
-        if (!$level) {
-            $level = ini_get(self::OTEL_LOG_LEVEL);
-        }
-        if (!$level) {
-            $level = self::DEFAULT_LEVEL;
-        }
+        $level = Configuration::getEnum(Variables::OTEL_LOG_LEVEL, self::DEFAULT_LEVEL);
 
         return self::level($level);
     }
diff --git a/src/API/Instrumentation/ConfigurationResolver.php b/src/API/Instrumentation/ConfigurationResolver.php
deleted file mode 100644
index bb5619c30..000000000
--- a/src/API/Instrumentation/ConfigurationResolver.php
+++ /dev/null
@@ -1,77 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace OpenTelemetry\API\Instrumentation;
-
-class ConfigurationResolver implements ConfigurationResolverInterface
-{
-    public function has(string $name): bool
-    {
-        return $this->getVariable($name) !== null;
-    }
-
-    public function getString(string $name): ?string
-    {
-        return $this->getVariable($name);
-    }
-
-    public function getBoolean(string $name): ?bool
-    {
-        $value = $this->getVariable($name);
-        if ($value === null) {
-            return null;
-        }
-
-        return ($value === 'true');
-    }
-
-    public function getInt(string $name): ?int
-    {
-        $value = $this->getVariable($name);
-        if ($value === null) {
-            return null;
-        }
-        if (filter_var($value, FILTER_VALIDATE_INT) === false) {
-            //log warning
-            return null;
-        }
-
-        return (int) $value;
-    }
-
-    public function getList(string $name): array
-    {
-        $value = $this->getVariable($name);
-        if ($value === null) {
-            return [];
-        }
-
-        return explode(',', $value);
-    }
-
-    private function getVariable(string $name): ?string
-    {
-        $value = $_SERVER[$name] ?? null;
-        if ($value !== false && !self::isEmpty($value)) {
-            assert(is_string($value));
-
-            return $value;
-        }
-        $value = getenv($name);
-        if ($value !== false && !self::isEmpty($value)) {
-            return $value;
-        }
-        $value = ini_get($name);
-        if ($value !== false && !self::isEmpty($value)) {
-            return $value;
-        }
-
-        return null;
-    }
-
-    private static function isEmpty($value): bool
-    {
-        return $value === false || $value === null || $value === '';
-    }
-}
diff --git a/src/API/Instrumentation/ConfigurationResolverInterface.php b/src/API/Instrumentation/ConfigurationResolverInterface.php
deleted file mode 100644
index 79bd94047..000000000
--- a/src/API/Instrumentation/ConfigurationResolverInterface.php
+++ /dev/null
@@ -1,14 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace OpenTelemetry\API\Instrumentation;
-
-interface ConfigurationResolverInterface
-{
-    public function has(string $name): bool;
-    public function getString(string $name): ?string;
-    public function getBoolean(string $name): ?bool;
-    public function getInt(string $name): ?int;
-    public function getList(string $name): array;
-}
diff --git a/src/API/composer.json b/src/API/composer.json
index 8d13e9994..84e89f680 100644
--- a/src/API/composer.json
+++ b/src/API/composer.json
@@ -18,6 +18,7 @@
     ],
     "require": {
         "php": "^8.1",
+        "open-telemetry/config": "*",
         "open-telemetry/context": "^1.0",
         "psr/log": "^1.1|^2.0|^3.0",
         "symfony/polyfill-php82": "^1.26"
diff --git a/src/SDK/Common/Util/ClassConstantAccessor.php b/src/Config/Configuration/Accessor/ClassConstantAccessor.php
similarity index 87%
rename from src/SDK/Common/Util/ClassConstantAccessor.php
rename to src/Config/Configuration/Accessor/ClassConstantAccessor.php
index b4ab1198e..200b0131a 100644
--- a/src/SDK/Common/Util/ClassConstantAccessor.php
+++ b/src/Config/Configuration/Accessor/ClassConstantAccessor.php
@@ -2,13 +2,16 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Util;
+namespace OpenTelemetry\Config\Configuration\Accessor;
 
 use LogicException;
 
+/**
+ * @internal
+ */
 class ClassConstantAccessor
 {
-    public static function requireValue(string $className, string $constantName)
+    public static function requireValue(string $className, string $constantName): mixed
     {
         $constant = self::getFullName($className, $constantName);
 
@@ -21,7 +24,7 @@ public static function requireValue(string $className, string $constantName)
         return constant($constant);
     }
 
-    public static function getValue(string $className, string $constantName)
+    public static function getValue(string $className, string $constantName): mixed
     {
         $constant = self::getFullName($className, $constantName);
 
diff --git a/src/SDK/Common/Configuration/Resolver/PhpIniAccessor.php b/src/Config/Configuration/Accessor/PhpIniAccessor.php
similarity index 52%
rename from src/SDK/Common/Configuration/Resolver/PhpIniAccessor.php
rename to src/Config/Configuration/Accessor/PhpIniAccessor.php
index a12b507e8..0fb830a69 100644
--- a/src/SDK/Common/Configuration/Resolver/PhpIniAccessor.php
+++ b/src/Config/Configuration/Accessor/PhpIniAccessor.php
@@ -2,16 +2,17 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Config\Configuration\Accessor;
 
+/**
+ * @internal
+ */
 class PhpIniAccessor
 {
     /**
      * Mockable accessor for php.ini values
-     * @internal
-     * @return array|false|string
      */
-    public function get(string $variableName)
+    public function get(string $variableName): array|false|string
     {
         return get_cfg_var($variableName);
     }
diff --git a/src/SDK/Common/Configuration/Configuration.php b/src/Config/Configuration/Configuration.php
similarity index 51%
rename from src/SDK/Common/Configuration/Configuration.php
rename to src/Config/Configuration/Configuration.php
index e716f76ff..f28bef2d4 100644
--- a/src/SDK/Common/Configuration/Configuration.php
+++ b/src/Config/Configuration/Configuration.php
@@ -2,28 +2,24 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration;
-
-use InvalidArgumentException;
-use OpenTelemetry\API\Behavior\LogsMessagesTrait;
-use OpenTelemetry\SDK\Common\Configuration\Parser\BooleanParser;
-use OpenTelemetry\SDK\Common\Configuration\Parser\ListParser;
-use OpenTelemetry\SDK\Common\Configuration\Parser\MapParser;
-use OpenTelemetry\SDK\Common\Configuration\Parser\RatioParser;
-use OpenTelemetry\SDK\Common\Configuration\Resolver\CompositeResolver;
-use OpenTelemetry\SDK\Common\Util\ClassConstantAccessor;
+namespace OpenTelemetry\Config\Configuration;
+
+use OpenTelemetry\Config\Configuration\Accessor\ClassConstantAccessor;
+use OpenTelemetry\Config\Configuration\Parser\BooleanParser;
+use OpenTelemetry\Config\Configuration\Parser\ListParser;
+use OpenTelemetry\Config\Configuration\Parser\MapParser;
+use OpenTelemetry\Config\Configuration\Parser\RatioParser;
+use OpenTelemetry\Config\Configuration\Resolver\CompositeResolver;
 use UnexpectedValueException;
 
 /**
  * Configuration can come from one or more of the following sources (from highest to lowest priority):
+ * - environment variable (getenv, $_SERVER)
  * - values defined in php.ini
- * - environment variable ($_SERVER)
  * - configuration file (todo)
  */
 class Configuration
 {
-    use LogsMessagesTrait;
-
     public static function has(string $name): bool
     {
         return CompositeResolver::instance()->hasVariable($name);
@@ -32,10 +28,7 @@ public static function has(string $name): bool
     public static function getInt(string $key, ?int $default = null): int
     {
         return (int) self::validateVariableValue(
-            CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::INTEGER),
-                $default
-            ),
+            CompositeResolver::instance()->resolve($key, $default),
             FILTER_VALIDATE_INT
         );
     }
@@ -43,10 +36,7 @@ public static function getInt(string $key, ?int $default = null): int
     public static function getString(string $key, ?string $default = null): string
     {
         return (string) self::validateVariableValue(
-            CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::STRING),
-                $default
-            )
+            CompositeResolver::instance()->resolve($key, $default),
         );
     }
 
@@ -54,21 +44,15 @@ public static function getBoolean(string $key, ?bool $default = null): bool
     {
         $resolved = self::validateVariableValue(
             CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::BOOL),
+                $key,
                 null === $default ? $default : ($default ? 'true' : 'false')
             )
         );
 
-        try {
-            return BooleanParser::parse($resolved);
-        } catch (InvalidArgumentException) {
-            self::logWarning(sprintf('Invalid boolean value "%s" interpreted as "false" for %s', $resolved, $key));
-
-            return false;
-        }
+        return BooleanParser::parse($resolved);
     }
 
-    public static function getMixed(string $key, $default = null)
+    public static function getMixed(string $key, $default = null): mixed
     {
         return self::validateVariableValue(
             CompositeResolver::instance()->resolve(
@@ -81,40 +65,28 @@ public static function getMixed(string $key, $default = null)
     public static function getMap(string $key, ?array $default = null): array
     {
         return MapParser::parse(
-            CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::MAP),
-                $default
-            )
+            CompositeResolver::instance()->resolve($key, $default),
         );
     }
 
     public static function getList(string $key, ?array $default = null): array
     {
         return ListParser::parse(
-            CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::LIST),
-                $default
-            )
+            CompositeResolver::instance()->resolve($key, $default),
         );
     }
 
     public static function getEnum(string $key, ?string $default = null): string
     {
         return (string) self::validateVariableValue(
-            CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::ENUM),
-                $default
-            )
+            CompositeResolver::instance()->resolve($key, $default),
         );
     }
 
     public static function getFloat(string $key, ?float $default = null): float
     {
         return (float) self::validateVariableValue(
-            CompositeResolver::instance()->resolve(
-                self::validateVariableType($key, VariableTypes::FLOAT),
-                $default
-            ),
+            CompositeResolver::instance()->resolve($key, $default),
             FILTER_VALIDATE_FLOAT
         );
     }
@@ -123,10 +95,7 @@ public static function getRatio(string $key, ?float $default = null): float
     {
         return RatioParser::parse(
             self::validateVariableValue(
-                CompositeResolver::instance()->resolve(
-                    self::validateVariableType($key, VariableTypes::RATIO),
-                    $default
-                )
+                CompositeResolver::instance()->resolve($key, $default),
             )
         );
     }
@@ -141,31 +110,13 @@ public static function getDefault(string $variableName)
         return ClassConstantAccessor::getValue(Defaults::class, $variableName);
     }
 
-    public static function getType(string $variableName): ?string
-    {
-        return ClassConstantAccessor::getValue(ValueTypes::class, $variableName);
-    }
-
     public static function isEmpty($value): bool
     {
         // don't use 'empty()', since '0' is not considered to be empty
         return $value === null || $value === '';
     }
 
-    private static function validateVariableType(string $variableName, string $type): string
-    {
-        $variableType = self::getType($variableName);
-
-        if ($variableType !== null && $variableType !== $type && $variableType !== VariableTypes::MIXED) {
-            throw new UnexpectedValueException(
-                sprintf('Variable "%s" is not supposed to be of type "%s" but type "%s"', $variableName, $type, $variableType)
-            );
-        }
-
-        return $variableName;
-    }
-
-    private static function validateVariableValue($value, ?int $filterType = null)
+    private static function validateVariableValue(mixed $value, ?int $filterType = null): mixed
     {
         if ($filterType !== null && filter_var($value, $filterType) === false) {
             throw new UnexpectedValueException(sprintf('Value has invalid type "%s"', gettype($value)));
diff --git a/src/SDK/Common/Configuration/Defaults.php b/src/Config/Configuration/Defaults.php
similarity index 97%
rename from src/SDK/Common/Configuration/Defaults.php
rename to src/Config/Configuration/Defaults.php
index fcfea6e4e..7aa95bb7e 100644
--- a/src/SDK/Common/Configuration/Defaults.php
+++ b/src/Config/Configuration/Defaults.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration;
+namespace OpenTelemetry\Config\Configuration;
 
 /**
  * Default values for environment variables defined by the OpenTelemetry specification and language specific variables for the PHP SDK.
@@ -119,4 +119,6 @@ interface Defaults
     public const OTEL_PHP_DISABLED_INSTRUMENTATIONS = [];
     public const OTEL_PHP_LOGS_PROCESSOR = 'batch';
     public const OTEL_PHP_LOG_DESTINATION = 'default';
+    public const OTEL_PHP_DEBUG_SCOPES_DISABLED = 'false';
+    public const OTEL_PHP_FIBERS_ENABLED = 'false';
 }
diff --git a/src/SDK/Common/Configuration/KnownValues.php b/src/Config/Configuration/KnownValues.php
similarity index 99%
rename from src/SDK/Common/Configuration/KnownValues.php
rename to src/Config/Configuration/KnownValues.php
index a7636214c..0387e3e6e 100644
--- a/src/SDK/Common/Configuration/KnownValues.php
+++ b/src/Config/Configuration/KnownValues.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration;
+namespace OpenTelemetry\Config\Configuration;
 
 use Psr\Log\LogLevel;
 
diff --git a/src/SDK/Common/Configuration/Parser/BooleanParser.php b/src/Config/Configuration/Parser/BooleanParser.php
similarity index 78%
rename from src/SDK/Common/Configuration/Parser/BooleanParser.php
rename to src/Config/Configuration/Parser/BooleanParser.php
index 4141c61ef..50e054fe8 100644
--- a/src/SDK/Common/Configuration/Parser/BooleanParser.php
+++ b/src/Config/Configuration/Parser/BooleanParser.php
@@ -2,19 +2,19 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Config\Configuration\Parser;
 
 use InvalidArgumentException;
 
+/**
+ * @internal
+ */
 class BooleanParser
 {
     private const TRUE_VALUE = 'true';
     private const FALSE_VALUE = 'false';
 
-    /**
-     * @param string|bool $value
-     */
-    public static function parse($value): bool
+    public static function parse(string|bool $value): bool
     {
         if (is_bool($value)) {
             return $value;
diff --git a/src/SDK/Common/Configuration/Parser/ListParser.php b/src/Config/Configuration/Parser/ListParser.php
similarity index 71%
rename from src/SDK/Common/Configuration/Parser/ListParser.php
rename to src/Config/Configuration/Parser/ListParser.php
index f27b16597..3edf0cbe2 100644
--- a/src/SDK/Common/Configuration/Parser/ListParser.php
+++ b/src/Config/Configuration/Parser/ListParser.php
@@ -2,16 +2,16 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Config\Configuration\Parser;
 
+/**
+ * @internal
+ */
 class ListParser
 {
     private const DEFAULT_SEPARATOR = ',';
 
-    /**
-     * @param string|array $value
-     */
-    public static function parse($value): array
+    public static function parse(string|array $value): array
     {
         if (is_array($value)) {
             return $value;
diff --git a/src/SDK/Common/Configuration/Parser/MapParser.php b/src/Config/Configuration/Parser/MapParser.php
similarity index 72%
rename from src/SDK/Common/Configuration/Parser/MapParser.php
rename to src/Config/Configuration/Parser/MapParser.php
index b6404bb70..3a352c197 100644
--- a/src/SDK/Common/Configuration/Parser/MapParser.php
+++ b/src/Config/Configuration/Parser/MapParser.php
@@ -2,27 +2,30 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Config\Configuration\Parser;
 
 use InvalidArgumentException;
 
+/**
+ * @internal
+ */
 class MapParser
 {
     private const VARIABLE_SEPARATOR = ',';
     private const KEY_VALUE_SEPARATOR = '=';
 
-    public static function parse($value): array
+    public static function parse(string|array|null $value): array
     {
         if (is_array($value)) {
             return $value;
         }
         $result = [];
 
-        if (null === $value || trim((string) $value) === '') {
+        if (null === $value || trim($value) === '') {
             return $result;
         }
 
-        foreach (explode(self::VARIABLE_SEPARATOR, (string) $value) as $pair) {
+        foreach (explode(self::VARIABLE_SEPARATOR, $value) as $pair) {
             self::validateKeyValuePair($pair);
 
             /** @psalm-suppress PossiblyUndefinedArrayOffset */
@@ -33,7 +36,7 @@ public static function parse($value): array
         return $result;
     }
 
-    private static function validateKeyValuePair(string $pair)
+    private static function validateKeyValuePair(string $pair): void
     {
         if (!str_contains($pair, self::KEY_VALUE_SEPARATOR)) {
             throw new InvalidArgumentException(sprintf(
diff --git a/src/SDK/Common/Configuration/Parser/RatioParser.php b/src/Config/Configuration/Parser/RatioParser.php
similarity index 85%
rename from src/SDK/Common/Configuration/Parser/RatioParser.php
rename to src/Config/Configuration/Parser/RatioParser.php
index f0fe32100..ff9335e6c 100644
--- a/src/SDK/Common/Configuration/Parser/RatioParser.php
+++ b/src/Config/Configuration/Parser/RatioParser.php
@@ -2,17 +2,20 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Config\Configuration\Parser;
 
 use InvalidArgumentException;
 use RangeException;
 
+/**
+ * @internal
+ */
 class RatioParser
 {
     private const MAX_VALUE = 1;
     private const MIN_VALUE = 0;
 
-    public static function parse($value): float
+    public static function parse(string|int|float $value): float
     {
         if (filter_var($value, FILTER_VALIDATE_FLOAT) === false) {
             throw new InvalidArgumentException(
diff --git a/src/SDK/Common/Configuration/Resolver/CompositeResolver.php b/src/Config/Configuration/Resolver/CompositeResolver.php
similarity index 85%
rename from src/SDK/Common/Configuration/Resolver/CompositeResolver.php
rename to src/Config/Configuration/Resolver/CompositeResolver.php
index 1054b6239..4e13b5678 100644
--- a/src/SDK/Common/Configuration/Resolver/CompositeResolver.php
+++ b/src/Config/Configuration/Resolver/CompositeResolver.php
@@ -2,16 +2,16 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Config\Configuration\Resolver;
 
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Configuration;
 
 /**
  * @internal
  */
 class CompositeResolver
 {
-    /** @var list<ResolverInterface> */
+    /** @var ResolverInterface[] */
     private array $resolvers = [];
 
     public static function instance(): self
@@ -42,7 +42,7 @@ public function getResolvers(): array
         return $this->resolvers;
     }
 
-    public function resolve(string $variableName, $default = '')
+    public function resolve(string $variableName, mixed $default = ''): mixed
     {
         foreach ($this->resolvers as $resolver) {
             if ($resolver->hasVariable($variableName)) {
diff --git a/src/SDK/Common/Configuration/Resolver/EnvironmentResolver.php b/src/Config/Configuration/Resolver/EnvironmentResolver.php
similarity index 69%
rename from src/SDK/Common/Configuration/Resolver/EnvironmentResolver.php
rename to src/Config/Configuration/Resolver/EnvironmentResolver.php
index 453f98e39..c7d223a0e 100644
--- a/src/SDK/Common/Configuration/Resolver/EnvironmentResolver.php
+++ b/src/Config/Configuration/Resolver/EnvironmentResolver.php
@@ -2,9 +2,9 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Config\Configuration\Resolver;
 
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Configuration;
 
 /**
  * @internal
@@ -24,11 +24,7 @@ public function hasVariable(string $variableName): bool
         return !Configuration::isEmpty($env);
     }
 
-    /**
-     * @psalm-suppress InvalidReturnStatement
-     * @psalm-suppress InvalidReturnType
-     */
-    public function retrieveValue(string $variableName)
+    public function retrieveValue(string $variableName): mixed
     {
         $value = getenv($variableName);
         if ($value === false) {
diff --git a/src/SDK/Common/Configuration/Resolver/PhpIniResolver.php b/src/Config/Configuration/Resolver/PhpIniResolver.php
similarity index 74%
rename from src/SDK/Common/Configuration/Resolver/PhpIniResolver.php
rename to src/Config/Configuration/Resolver/PhpIniResolver.php
index 29445dd88..066e01a72 100644
--- a/src/SDK/Common/Configuration/Resolver/PhpIniResolver.php
+++ b/src/Config/Configuration/Resolver/PhpIniResolver.php
@@ -2,9 +2,10 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Config\Configuration\Resolver;
 
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Accessor\PhpIniAccessor;
+use OpenTelemetry\Config\Configuration\Configuration;
 
 /**
  * @internal
@@ -16,7 +17,7 @@ public function __construct(private readonly PhpIniAccessor $accessor = new PhpI
     {
     }
 
-    public function retrieveValue(string $variableName)
+    public function retrieveValue(string $variableName): string|bool
     {
         $value = $this->accessor->get($variableName) ?: '';
         if (is_array($value)) {
diff --git a/src/Config/Configuration/Resolver/ResolverInterface.php b/src/Config/Configuration/Resolver/ResolverInterface.php
new file mode 100644
index 000000000..a9ec8a9aa
--- /dev/null
+++ b/src/Config/Configuration/Resolver/ResolverInterface.php
@@ -0,0 +1,12 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\Config\Configuration\Resolver;
+
+interface ResolverInterface
+{
+    public function retrieveValue(string $variableName): mixed;
+
+    public function hasVariable(string $variableName): bool;
+}
diff --git a/src/SDK/Common/Configuration/Variables.php b/src/Config/Configuration/Variables.php
similarity index 97%
rename from src/SDK/Common/Configuration/Variables.php
rename to src/Config/Configuration/Variables.php
index 8ccb28ac1..660860071 100644
--- a/src/SDK/Common/Configuration/Variables.php
+++ b/src/Config/Configuration/Variables.php
@@ -2,7 +2,7 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\SDK\Common\Configuration;
+namespace OpenTelemetry\Config\Configuration;
 
 /**
  * Environment variables defined by the OpenTelemetry specification and language specific variables for the PHP SDK.
@@ -138,6 +138,8 @@ interface Variables
     public const OTEL_PHP_DETECTORS = 'OTEL_PHP_DETECTORS';
     public const OTEL_PHP_AUTOLOAD_ENABLED = 'OTEL_PHP_AUTOLOAD_ENABLED';
     public const OTEL_PHP_INTERNAL_METRICS_ENABLED = 'OTEL_PHP_INTERNAL_METRICS_ENABLED'; //whether the SDK should emit its own metrics
+    public const OTEL_PHP_DEBUG_SCOPES_DISABLED = 'OTEL_PHP_DEBUG_SCOPES_DISABLED';
     public const OTEL_PHP_DISABLED_INSTRUMENTATIONS = 'OTEL_PHP_DISABLED_INSTRUMENTATIONS';
     public const OTEL_PHP_EXCLUDED_URLS = 'OTEL_PHP_EXCLUDED_URLS';
+    public const OTEL_PHP_FIBERS_ENABLED = 'OTEL_PHP_FIBERS_ENABLED';
 }
diff --git a/src/Config/Configuration/composer.json b/src/Config/Configuration/composer.json
new file mode 100644
index 000000000..106863863
--- /dev/null
+++ b/src/Config/Configuration/composer.json
@@ -0,0 +1,33 @@
+{
+    "name": "open-telemetry/config",
+    "description": "Configuration management for OpenTelemetry PHP.",
+    "keywords": ["opentelemetry", "otel", "config"],
+    "type": "library",
+    "support": {
+        "issues": "https://github.com/open-telemetry/opentelemetry-php/issues",
+        "source": "https://github.com/open-telemetry/opentelemetry-php",
+        "docs": "https://opentelemetry.io/docs/php",
+        "chat": "https://app.slack.com/client/T08PSQ7BQ/C01NFPCV44V"
+    },
+    "license": "Apache-2.0",
+    "authors": [
+        {
+            "name": "opentelemetry-php contributors",
+            "homepage": "https://github.com/open-telemetry/opentelemetry-php/graphs/contributors"
+        }
+    ],
+    "require": {
+        "php": "^8.1",
+        "psr/log": "^1.1|^2.0|^3.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "OpenTelemetry\\Config\\": "."
+        }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-main": "1.0.x-dev"
+        }
+    }
+}
diff --git a/src/Context/Context.php b/src/Context/Context.php
index e64e533a4..579bfef9f 100644
--- a/src/Context/Context.php
+++ b/src/Context/Context.php
@@ -5,8 +5,8 @@
 namespace OpenTelemetry\Context;
 
 use function assert;
-use const FILTER_VALIDATE_BOOLEAN;
-use function filter_var;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use function spl_object_id;
 
 /**
@@ -14,8 +14,6 @@
  */
 final class Context implements ContextInterface
 {
-    private const OTEL_PHP_DEBUG_SCOPES_DISABLED = 'OTEL_PHP_DEBUG_SCOPES_DISABLED';
-
     private static ContextStorageInterface&ExecutionContextAwareInterface $storage;
 
     // Optimization for spans to avoid copying the context array.
@@ -83,10 +81,7 @@ public function activate(): ScopeInterface
 
     private static function debugScopesDisabled(): bool
     {
-        return filter_var(
-            $_SERVER[self::OTEL_PHP_DEBUG_SCOPES_DISABLED] ?? \getenv(self::OTEL_PHP_DEBUG_SCOPES_DISABLED) ?: \ini_get(self::OTEL_PHP_DEBUG_SCOPES_DISABLED),
-            FILTER_VALIDATE_BOOLEAN
-        );
+        return Configuration::getBoolean(Variables::OTEL_PHP_DEBUG_SCOPES_DISABLED);
     }
 
     public function withContextValue(ImplicitContextKeyedInterface $value): ContextInterface
diff --git a/src/Context/README.md b/src/Context/README.md
index d589dc0ad..addff9e0f 100644
--- a/src/Context/README.md
+++ b/src/Context/README.md
@@ -34,14 +34,14 @@ It is recommended to use a `try-finally` statement after `::activate()` to ensur
 ### Debug scopes
 
 By default, scopes created by `::activate()` warn on invalid and missing calls to `::detach()` in non-production
-environments. This feature can be disabled by setting the environment variable `OTEL_PHP_DEBUG_SCOPES_DISABLED` to a
-truthy value. Disabling is only recommended for applications using `exit` / `die` to prevent unavoidable notices.
+environments. This feature can be disabled by setting the environment variable `OTEL_PHP_DEBUG_SCOPES_DISABLED` to `true`.
+Disabling is only recommended for applications using `exit` / `die` to prevent unavoidable notices.
 
 ## Async applications
 
 ### Fiber support - automatic context propagation to newly created fibers
 
-Requires an NTS build, `ext-ffi`, and setting the environment variable `OTEL_PHP_FIBERS_ENABLED` to a truthy value. Additionally `vendor/autoload.php` has to be preloaded for non-CLI SAPIs if [`ffi.enable`](https://www.php.net/manual/en/ffi.configuration.php#ini.ffi.enable) is set to `preload`.
+Requires `PHP >= 8.1`, an NTS build, `ext-ffi`, and setting the environment variable `OTEL_PHP_FIBERS_ENABLED` to `true`. Additionally `vendor/autoload.php` has to be preloaded for non-CLI SAPIs if [`ffi.enable`](https://www.php.net/manual/en/ffi.configuration.php#ini.ffi.enable) is set to `preload`.
 
 ### Event loops
 
diff --git a/src/Context/ZendObserverFiber.php b/src/Context/ZendObserverFiber.php
index b700307e3..2db82d50a 100644
--- a/src/Context/ZendObserverFiber.php
+++ b/src/Context/ZendObserverFiber.php
@@ -11,9 +11,8 @@
 
 use function extension_loaded;
 use FFI;
-use const FILTER_VALIDATE_BOOLEAN;
-use function filter_var;
-use function is_string;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use const PHP_VERSION_ID;
 use const PHP_ZTS;
 use function sprintf;
@@ -26,11 +25,7 @@ final class ZendObserverFiber
 {
     public static function isEnabled(): bool
     {
-        $enabled = $_SERVER['OTEL_PHP_FIBERS_ENABLED'] ?? false;
-
-        return is_string($enabled)
-            ? filter_var($enabled, FILTER_VALIDATE_BOOLEAN)
-            : (bool) $enabled;
+        return Configuration::getBoolean(Variables::OTEL_PHP_FIBERS_ENABLED);
     }
 
     public static function init(): bool
diff --git a/src/Context/composer.json b/src/Context/composer.json
index 2717e8e3b..c4b6e13c8 100644
--- a/src/Context/composer.json
+++ b/src/Context/composer.json
@@ -18,6 +18,8 @@
     ],
     "require": {
         "php": "^8.1",
+        "open-telemetry/config": "*",
+        "symfony/polyfill-php81": "^1.26",
         "symfony/polyfill-php82": "^1.26"
     },
     "autoload": {
diff --git a/src/Contrib/Otlp/LogsExporterFactory.php b/src/Contrib/Otlp/LogsExporterFactory.php
index a92cffa3b..62def8ea9 100644
--- a/src/Contrib/Otlp/LogsExporterFactory.php
+++ b/src/Contrib/Otlp/LogsExporterFactory.php
@@ -5,9 +5,9 @@
 namespace OpenTelemetry\Contrib\Otlp;
 
 use OpenTelemetry\API\Signals;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Defaults;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Defaults;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
 use OpenTelemetry\SDK\Common\Export\TransportInterface;
 use OpenTelemetry\SDK\Logs\LogRecordExporterFactoryInterface;
diff --git a/src/Contrib/Otlp/MetricExporterFactory.php b/src/Contrib/Otlp/MetricExporterFactory.php
index 1ba7488f3..3ed4b343a 100644
--- a/src/Contrib/Otlp/MetricExporterFactory.php
+++ b/src/Contrib/Otlp/MetricExporterFactory.php
@@ -5,9 +5,9 @@
 namespace OpenTelemetry\Contrib\Otlp;
 
 use OpenTelemetry\API\Signals;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Defaults;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Defaults;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
 use OpenTelemetry\SDK\Common\Export\TransportInterface;
 use OpenTelemetry\SDK\Metrics\Data\Temporality;
diff --git a/src/Contrib/Otlp/OtlpUtil.php b/src/Contrib/Otlp/OtlpUtil.php
index 3de3085d6..774dd8497 100644
--- a/src/Contrib/Otlp/OtlpUtil.php
+++ b/src/Contrib/Otlp/OtlpUtil.php
@@ -6,8 +6,8 @@
 
 use function explode;
 use OpenTelemetry\API\Signals;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Resource\Detectors\Sdk;
 use OpenTelemetry\SemConv\ResourceAttributes;
 use UnexpectedValueException;
diff --git a/src/Contrib/Otlp/Protocols.php b/src/Contrib/Otlp/Protocols.php
index 736436a8f..d4c90d12c 100644
--- a/src/Contrib/Otlp/Protocols.php
+++ b/src/Contrib/Otlp/Protocols.php
@@ -4,7 +4,7 @@
 
 namespace OpenTelemetry\Contrib\Otlp;
 
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\KnownValues;
 use UnexpectedValueException;
 
 class Protocols
diff --git a/src/Contrib/Otlp/SpanExporterFactory.php b/src/Contrib/Otlp/SpanExporterFactory.php
index 1ef7d49aa..508f87b33 100644
--- a/src/Contrib/Otlp/SpanExporterFactory.php
+++ b/src/Contrib/Otlp/SpanExporterFactory.php
@@ -6,9 +6,9 @@
 
 use OpenTelemetry\API\Behavior\LogsMessagesTrait;
 use OpenTelemetry\API\Signals;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Defaults;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Defaults;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
 use OpenTelemetry\SDK\Common\Export\TransportInterface;
 use OpenTelemetry\SDK\Registry;
diff --git a/src/Contrib/Zipkin/SpanExporterFactory.php b/src/Contrib/Zipkin/SpanExporterFactory.php
index 0714d48da..ec8a6f2db 100644
--- a/src/Contrib/Zipkin/SpanExporterFactory.php
+++ b/src/Contrib/Zipkin/SpanExporterFactory.php
@@ -4,8 +4,8 @@
 
 namespace OpenTelemetry\Contrib\Zipkin;
 
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\Http\PsrTransportFactory;
 use OpenTelemetry\SDK\Trace\SpanExporter\SpanExporterFactoryInterface;
 use OpenTelemetry\SDK\Trace\SpanExporterInterface;
diff --git a/src/SDK/Common/Configuration/Resolver/ResolverInterface.php b/src/SDK/Common/Configuration/Resolver/ResolverInterface.php
deleted file mode 100644
index 4e88f3ff6..000000000
--- a/src/SDK/Common/Configuration/Resolver/ResolverInterface.php
+++ /dev/null
@@ -1,15 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace OpenTelemetry\SDK\Common\Configuration\Resolver;
-
-interface ResolverInterface
-{
-    /**
-     * @return mixed
-     */
-    public function retrieveValue(string $variableName);
-
-    public function hasVariable(string $variableName): bool;
-}
diff --git a/src/SDK/Common/Configuration/ValueTypes.php b/src/SDK/Common/Configuration/ValueTypes.php
deleted file mode 100644
index 64a69f6a7..000000000
--- a/src/SDK/Common/Configuration/ValueTypes.php
+++ /dev/null
@@ -1,133 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace OpenTelemetry\SDK\Common\Configuration;
-
-/**
- * Environment variables defined by the OpenTelemetry specification and language specific variables for the PHP SDK.
- * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md
- */
-interface ValueTypes
-{
-    /**
-     * General SDK Configuration
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#general-sdk-configuration
-     */
-    public const OTEL_RESOURCE_ATTRIBUTES = VariableTypes::MAP;
-    public const OTEL_SERVICE_NAME = VariableTypes::STRING;
-    public const OTEL_LOG_LEVEL = VariableTypes::ENUM;
-    public const OTEL_PROPAGATORS = VariableTypes::LIST;
-    public const OTEL_TRACES_SAMPLER = VariableTypes::STRING;
-    public const OTEL_TRACES_SAMPLER_ARG = VariableTypes::MIXED;
-    /**
-     * Batch Span Processor
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#batch-span-processor
-     */
-    public const OTEL_BSP_SCHEDULE_DELAY = VariableTypes::INTEGER;
-    public const OTEL_BSP_EXPORT_TIMEOUT = VariableTypes::INTEGER;
-    public const OTEL_BSP_MAX_QUEUE_SIZE = VariableTypes::INTEGER;
-    public const OTEL_BSP_MAX_EXPORT_BATCH_SIZE = VariableTypes::INTEGER;
-    /**
-     * Batch LogRecord Processor
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#batch-logrecord-processor
-     */
-    public const OTEL_BLRP_SCHEDULE_DELAY = VariableTypes::INTEGER;
-    public const OTEL_BLRP_EXPORT_TIMEOUT = VariableTypes::INTEGER;
-    public const OTEL_BLRP_MAX_QUEUE_SIZE = VariableTypes::INTEGER;
-    public const OTEL_BLRP_MAX_EXPORT_BATCH_SIZE = VariableTypes::INTEGER;
-    /**
-     * Attribute Limits
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#attribute-limits
-     */
-    public const OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_ATTRIBUTE_COUNT_LIMIT = VariableTypes::INTEGER;
-    /**
-     * Span Limits
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#span-limits
-     */
-    public const OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_SPAN_EVENT_COUNT_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_SPAN_LINK_COUNT_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_LINK_ATTRIBUTE_COUNT_LIMIT = VariableTypes::INTEGER;
-    /**
-     * LogRecord Limits
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#logrecord-limits
-     */
-    public const OTEL_LOGRECORD_ATTRIBUTE_VALUE_LENGTH_LIMIT = VariableTypes::INTEGER;
-    public const OTEL_LOGRECORD_ATTRIBUTE_COUNT_LIMIT = VariableTypes::INTEGER;
-    /**
-     * OTLP Exporter
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#configuration-options
-     */
-    // Endpoint
-    public const OTEL_EXPORTER_OTLP_ENDPOINT = VariableTypes::STRING;
-    public const OTEL_EXPORTER_OTLP_TRACES_ENDPOINT = VariableTypes::STRING;
-    public const OTEL_EXPORTER_OTLP_METRICS_ENDPOINT = VariableTypes::STRING;
-    // Insecure
-    public const OTEL_EXPORTER_OTLP_INSECURE = VariableTypes::BOOL;
-    public const OTEL_EXPORTER_OTLP_TRACES_INSECURE = VariableTypes::BOOL;
-    public const OTEL_EXPORTER_OTLP_METRICS_INSECURE = VariableTypes::BOOL;
-    // Certificate File
-    public const OTEL_EXPORTER_OTLP_CERTIFICATE = VariableTypes::STRING;
-    public const OTEL_EXPORTER_OTLP_TRACES_CERTIFICATE = VariableTypes::STRING;
-    public const OTEL_EXPORTER_OTLP_METRICS_CERTIFICATE = VariableTypes::STRING;
-    // Headers
-    public const OTEL_EXPORTER_OTLP_HEADERS = VariableTypes::MAP;
-    public const OTEL_EXPORTER_OTLP_TRACES_HEADERS = VariableTypes::MAP;
-    public const OTEL_EXPORTER_OTLP_METRICS_HEADERS = VariableTypes::MAP;
-    // Compression
-    public const OTEL_EXPORTER_OTLP_COMPRESSION = VariableTypes::ENUM;
-    public const OTEL_EXPORTER_OTLP_TRACES_COMPRESSION = VariableTypes::ENUM;
-    public const OTEL_EXPORTER_OTLP_METRICS_COMPRESSION = VariableTypes::ENUM;
-    // Timeout
-    public const OTEL_EXPORTER_OTLP_TIMEOUT = VariableTypes::INTEGER;
-    public const OTEL_EXPORTER_OTLP_TRACES_TIMEOUT = VariableTypes::INTEGER;
-    public const OTEL_EXPORTER_OTLP_METRICS_TIMEOUT = VariableTypes::INTEGER;
-    // Protocol
-    public const OTEL_EXPORTER_OTLP_PROTOCOL = VariableTypes::ENUM;
-    public const OTEL_EXPORTER_OTLP_TRACES_PROTOCOL = VariableTypes::ENUM;
-    public const OTEL_EXPORTER_OTLP_METRICS_PROTOCOL = VariableTypes::ENUM;
-    /**
-     * Zipkin Exporter
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#zipkin-exporter
-     */
-    public const OTEL_EXPORTER_ZIPKIN_ENDPOINT = VariableTypes::STRING;
-    public const OTEL_EXPORTER_ZIPKIN_TIMEOUT = VariableTypes::INTEGER;
-    public const OTEL_EXPORTER_ZIPKIN_PROTOCOL = VariableTypes::STRING;
-    /**
-     * Prometheus Exporter
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#prometheus-exporter
-     */
-    public const OTEL_EXPORTER_PROMETHEUS_HOST = VariableTypes::STRING;
-    public const OTEL_EXPORTER_PROMETHEUS_PORT = VariableTypes::INTEGER;
-    /**
-     * Exporter Selection
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#exporter-selection
-     */
-    public const OTEL_TRACES_EXPORTER = VariableTypes::LIST;
-    public const OTEL_METRICS_EXPORTER = VariableTypes::LIST;
-    public const OTEL_LOGS_EXPORTER = VariableTypes::LIST;
-    /**
-     * Metrics SDK Configuration
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#metrics-sdk-configuration
-     */
-    public const OTEL_METRICS_EXEMPLAR_FILTER = VariableTypes::ENUM;
-    public const OTEL_METRIC_EXPORT_INTERVAL = VariableTypes::INTEGER;
-    public const OTEL_METRIC_EXPORT_TIMEOUT = VariableTypes::INTEGER;
-    public const OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE = VariableTypes::ENUM;
-    public const OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION = VariableTypes::ENUM;
-    /**
-     * Language Specific Environment Variables
-     * @see https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/configuration/sdk-environment-variables.md#language-specific-environment-variables
-     */
-    public const OTEL_PHP_TRACES_PROCESSOR = VariableTypes::ENUM;
-    public const OTEL_PHP_LOGS_PROCESSOR = VariableTypes::LIST;
-    public const OTEL_PHP_DETECTORS = VariableTypes::LIST;
-    public const OTEL_PHP_AUTOLOAD_ENABLED = VariableTypes::BOOL;
-    public const OTEL_PHP_LOG_DESTINATION = VariableTypes::ENUM;
-    public const OTEL_PHP_INTERNAL_METRICS_ENABLED = VariableTypes::BOOL;
-    public const OTEL_PHP_DISABLED_INSTRUMENTATIONS = VariableTypes::LIST;
-}
diff --git a/src/SDK/Common/Configuration/VariableTypes.php b/src/SDK/Common/Configuration/VariableTypes.php
deleted file mode 100644
index 471632e16..000000000
--- a/src/SDK/Common/Configuration/VariableTypes.php
+++ /dev/null
@@ -1,62 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace OpenTelemetry\SDK\Common\Configuration;
-
-interface VariableTypes
-{
-    /**
-     * A single boolean value represented as a string or integer ('true', 'false', 0, 1)
-     * example: value1
-     */
-    public const BOOL = 'bool';
-
-    /**
-     * A single string value
-     * example: value1
-     */
-    public const STRING = 'string';
-
-    /**
-     * A single integer value
-     * example: 5000
-     */
-    public const INTEGER = 'integer';
-
-    /**
-     * A single float value
-     * example: 10.5
-     */
-    public const FLOAT = 'float';
-
-    /**
-     * A single float value between 0.0 and 1.0
-     * example: 0.5
-     */
-    public const RATIO = 'ratio';
-
-    /**
-     * A single string value from a fixed list of values
-     * example values: value1, value2, value3
-     * example: value1
-     */
-    public const ENUM = 'enum';
-
-    /**
-     * A comma separated list of single string values
-     * example: value1,value2,value3
-     */
-    public const LIST = 'list';
-
-    /**
-     * A comma separated list of key-value pairs
-     * example: key1=value1,key2=value2
-     */
-    public const MAP = 'map';
-
-    /**
-     * Values of mixed type
-     */
-    public const MIXED = 'mixed';
-}
diff --git a/src/SDK/Logs/ExporterFactory.php b/src/SDK/Logs/ExporterFactory.php
index 2a560ae95..a6bf1b6bf 100644
--- a/src/SDK/Logs/ExporterFactory.php
+++ b/src/SDK/Logs/ExporterFactory.php
@@ -5,8 +5,8 @@
 namespace OpenTelemetry\SDK\Logs;
 
 use InvalidArgumentException;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Logs\Exporter\NoopExporter;
 use OpenTelemetry\SDK\Registry;
 
diff --git a/src/SDK/Logs/LogRecordLimitsBuilder.php b/src/SDK/Logs/LogRecordLimitsBuilder.php
index 3aa5217ef..78eafeef5 100644
--- a/src/SDK/Logs/LogRecordLimitsBuilder.php
+++ b/src/SDK/Logs/LogRecordLimitsBuilder.php
@@ -4,9 +4,9 @@
 
 namespace OpenTelemetry\SDK\Logs;
 
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Attribute\Attributes;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use const PHP_INT_MAX;
 
 class LogRecordLimitsBuilder
diff --git a/src/SDK/Logs/LogRecordProcessorFactory.php b/src/SDK/Logs/LogRecordProcessorFactory.php
index dd778fcc7..272788f3d 100644
--- a/src/SDK/Logs/LogRecordProcessorFactory.php
+++ b/src/SDK/Logs/LogRecordProcessorFactory.php
@@ -7,10 +7,10 @@
 use InvalidArgumentException;
 use OpenTelemetry\API\Common\Time\Clock;
 use OpenTelemetry\API\Metrics\MeterProviderInterface;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues as Values;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\KnownValues as Values;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Logs\Processor\BatchLogRecordProcessor;
 use OpenTelemetry\SDK\Logs\Processor\MultiLogRecordProcessor;
 use OpenTelemetry\SDK\Logs\Processor\NoopLogRecordProcessor;
diff --git a/src/SDK/Metrics/MeterProviderFactory.php b/src/SDK/Metrics/MeterProviderFactory.php
index 0f62cec5f..52674eb59 100644
--- a/src/SDK/Metrics/MeterProviderFactory.php
+++ b/src/SDK/Metrics/MeterProviderFactory.php
@@ -6,9 +6,9 @@
 
 use InvalidArgumentException;
 use OpenTelemetry\API\Behavior\LogsMessagesTrait;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Metrics\Exemplar\ExemplarFilter\AllExemplarFilter;
 use OpenTelemetry\SDK\Metrics\Exemplar\ExemplarFilter\NoneExemplarFilter;
 use OpenTelemetry\SDK\Metrics\Exemplar\ExemplarFilter\WithSampledTraceExemplarFilter;
diff --git a/src/SDK/Propagation/PropagatorFactory.php b/src/SDK/Propagation/PropagatorFactory.php
index 66160aad3..f2ff7a13c 100644
--- a/src/SDK/Propagation/PropagatorFactory.php
+++ b/src/SDK/Propagation/PropagatorFactory.php
@@ -5,11 +5,11 @@
 namespace OpenTelemetry\SDK\Propagation;
 
 use OpenTelemetry\API\Behavior\LogsMessagesTrait;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Propagation\MultiTextMapPropagator;
 use OpenTelemetry\Context\Propagation\NoopTextMapPropagator;
 use OpenTelemetry\Context\Propagation\TextMapPropagatorInterface;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Registry;
 
 class PropagatorFactory
diff --git a/src/SDK/Propagation/_register.php b/src/SDK/Propagation/_register.php
index fd90da184..e053b5c74 100644
--- a/src/SDK/Propagation/_register.php
+++ b/src/SDK/Propagation/_register.php
@@ -3,14 +3,14 @@
 declare(strict_types=1);
 
 \OpenTelemetry\SDK\Registry::registerTextMapPropagator(
-    \OpenTelemetry\SDK\Common\Configuration\KnownValues::VALUE_BAGGAGE,
+    \OpenTelemetry\Config\Configuration\KnownValues::VALUE_BAGGAGE,
     \OpenTelemetry\API\Baggage\Propagation\BaggagePropagator::getInstance()
 );
 \OpenTelemetry\SDK\Registry::registerTextMapPropagator(
-    \OpenTelemetry\SDK\Common\Configuration\KnownValues::VALUE_TRACECONTEXT,
+    \OpenTelemetry\Config\Configuration\KnownValues::VALUE_TRACECONTEXT,
     \OpenTelemetry\API\Trace\Propagation\TraceContextPropagator::getInstance()
 );
 \OpenTelemetry\SDK\Registry::registerTextMapPropagator(
-    \OpenTelemetry\SDK\Common\Configuration\KnownValues::VALUE_NONE,
+    \OpenTelemetry\Config\Configuration\KnownValues::VALUE_NONE,
     \OpenTelemetry\Context\Propagation\NoopTextMapPropagator::getInstance()
 );
diff --git a/src/SDK/Resource/Detectors/Environment.php b/src/SDK/Resource/Detectors/Environment.php
index ceee8fcf7..61dca337f 100644
--- a/src/SDK/Resource/Detectors/Environment.php
+++ b/src/SDK/Resource/Detectors/Environment.php
@@ -4,9 +4,9 @@
 
 namespace OpenTelemetry\SDK\Resource\Detectors;
 
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Attribute\Attributes;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Resource\ResourceDetectorInterface;
 use OpenTelemetry\SDK\Resource\ResourceInfo;
 use OpenTelemetry\SemConv\ResourceAttributes;
diff --git a/src/SDK/Resource/ResourceInfoFactory.php b/src/SDK/Resource/ResourceInfoFactory.php
index 507d967de..20fe8151f 100644
--- a/src/SDK/Resource/ResourceInfoFactory.php
+++ b/src/SDK/Resource/ResourceInfoFactory.php
@@ -6,10 +6,10 @@
 
 use function in_array;
 use OpenTelemetry\API\Behavior\LogsMessagesTrait;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\KnownValues as Values;
+use OpenTelemetry\Config\Configuration\Variables as Env;
 use OpenTelemetry\SDK\Common\Attribute\Attributes;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues as Values;
-use OpenTelemetry\SDK\Common\Configuration\Variables as Env;
 use OpenTelemetry\SDK\Registry;
 use RuntimeException;
 
diff --git a/src/SDK/Sdk.php b/src/SDK/Sdk.php
index 8c6533f5e..7513e6c8c 100644
--- a/src/SDK/Sdk.php
+++ b/src/SDK/Sdk.php
@@ -6,9 +6,9 @@
 
 use OpenTelemetry\API\Metrics\MeterProviderInterface;
 use OpenTelemetry\API\Trace\TracerProviderInterface;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Propagation\TextMapPropagatorInterface;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Logs\LoggerProviderInterface;
 
 class Sdk
diff --git a/src/SDK/SdkAutoloader.php b/src/SDK/SdkAutoloader.php
index b1d5edca9..4242289d2 100644
--- a/src/SDK/SdkAutoloader.php
+++ b/src/SDK/SdkAutoloader.php
@@ -7,8 +7,8 @@
 use InvalidArgumentException;
 use OpenTelemetry\API\Globals;
 use OpenTelemetry\API\Instrumentation\Configurator;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Util\ShutdownHandler;
 use OpenTelemetry\SDK\Logs\LoggerProviderFactory;
 use OpenTelemetry\SDK\Metrics\MeterProviderFactory;
diff --git a/src/SDK/Trace/ExporterFactory.php b/src/SDK/Trace/ExporterFactory.php
index 9b652cc2f..87b3ba194 100644
--- a/src/SDK/Trace/ExporterFactory.php
+++ b/src/SDK/Trace/ExporterFactory.php
@@ -5,8 +5,8 @@
 namespace OpenTelemetry\SDK\Trace;
 
 use InvalidArgumentException;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Registry;
 use RuntimeException;
 
diff --git a/src/SDK/Trace/SamplerFactory.php b/src/SDK/Trace/SamplerFactory.php
index 09efbfc81..0e9831f8d 100644
--- a/src/SDK/Trace/SamplerFactory.php
+++ b/src/SDK/Trace/SamplerFactory.php
@@ -5,9 +5,9 @@
 namespace OpenTelemetry\SDK\Trace;
 
 use InvalidArgumentException;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues as Values;
-use OpenTelemetry\SDK\Common\Configuration\Variables as Env;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\KnownValues as Values;
+use OpenTelemetry\Config\Configuration\Variables as Env;
 use OpenTelemetry\SDK\Trace\Sampler\AlwaysOffSampler;
 use OpenTelemetry\SDK\Trace\Sampler\AlwaysOnSampler;
 use OpenTelemetry\SDK\Trace\Sampler\ParentBased;
diff --git a/src/SDK/Trace/SpanLimitsBuilder.php b/src/SDK/Trace/SpanLimitsBuilder.php
index 11ed5a82b..6b013aa59 100644
--- a/src/SDK/Trace/SpanLimitsBuilder.php
+++ b/src/SDK/Trace/SpanLimitsBuilder.php
@@ -4,10 +4,10 @@
 
 namespace OpenTelemetry\SDK\Trace;
 
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Variables as Env;
 use OpenTelemetry\SDK\Common\Attribute\Attributes;
 use OpenTelemetry\SDK\Common\Attribute\FilteredAttributesFactory;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Variables as Env;
 use OpenTelemetry\SemConv\TraceAttributes;
 use const PHP_INT_MAX;
 
diff --git a/src/SDK/Trace/SpanProcessorFactory.php b/src/SDK/Trace/SpanProcessorFactory.php
index 9b60f110a..63a4ddce8 100644
--- a/src/SDK/Trace/SpanProcessorFactory.php
+++ b/src/SDK/Trace/SpanProcessorFactory.php
@@ -6,9 +6,9 @@
 
 use InvalidArgumentException;
 use OpenTelemetry\API\Common\Time\Clock;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues as Values;
-use OpenTelemetry\SDK\Common\Configuration\Variables as Env;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\KnownValues as Values;
+use OpenTelemetry\Config\Configuration\Variables as Env;
 use OpenTelemetry\SDK\Metrics\MeterProviderInterface;
 use OpenTelemetry\SDK\Metrics\NoopMeterProvider;
 use OpenTelemetry\SDK\Trace\SpanProcessor\BatchSpanProcessor;
diff --git a/src/SDK/composer.json b/src/SDK/composer.json
index b84b94aa5..ef13c180a 100644
--- a/src/SDK/composer.json
+++ b/src/SDK/composer.json
@@ -19,7 +19,8 @@
     "require": {
         "php": "^8.1",
         "ext-json": "*",
-        "open-telemetry/api": "~1.0 || ~1.1",
+        "open-telemetry/api": "^1.0 || ~1.1",
+        "open-telemetry/config": "*",
         "open-telemetry/context": "^1.0",
         "open-telemetry/sem-conv": "^1.0",
         "php-http/discovery": "^1.14",
diff --git a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt
index f6ce0eb81..90acc2f86 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer.phpt
@@ -3,7 +3,7 @@ Context switches on execution context switch.
 --SKIPIF--
 <?php if (PHP_VERSION_ID < 80100 || !extension_loaded('ffi')) die('skip requires PHP8.1 and FFI'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=1
+OTEL_PHP_FIBERS_ENABLED=true
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;
diff --git a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt
index cce2314d5..cddb55f7a 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_ffi_observer_registered_on_startup.phpt
@@ -3,7 +3,7 @@ Fiber handler has to be loaded before fibers are used.
 --SKIPIF--
 <?php if (PHP_VERSION_ID < 80100 || !extension_loaded('ffi')) die('skip requires PHP8.1 and FFI'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=1
+OTEL_PHP_FIBERS_ENABLED=true
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;
diff --git a/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt b/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt
index ac93c2f97..504711ae7 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_not_supported.phpt
@@ -3,7 +3,7 @@ Context usage in fiber without fiber support triggers warning.
 --SKIPIF--
 <?php if (!class_exists(Fiber::class)) die('skip requires fibers'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=0
+OTEL_PHP_FIBERS_ENABLED=false
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;
diff --git a/tests/Integration/Context/Fiber/test_context_switching_not_supported_does_not_trigger_if_attached_before_usage.phpt b/tests/Integration/Context/Fiber/test_context_switching_not_supported_does_not_trigger_if_attached_before_usage.phpt
index bfe0a749e..9b48c5fdb 100644
--- a/tests/Integration/Context/Fiber/test_context_switching_not_supported_does_not_trigger_if_attached_before_usage.phpt
+++ b/tests/Integration/Context/Fiber/test_context_switching_not_supported_does_not_trigger_if_attached_before_usage.phpt
@@ -3,7 +3,7 @@ Context usage in fiber without fiber support does not trigger warning if context
 --SKIPIF--
 <?php if (!class_exists(Fiber::class)) die('skip requires fibers'); ?>
 --ENV--
-OTEL_PHP_FIBERS_ENABLED=0
+OTEL_PHP_FIBERS_ENABLED=false
 --FILE--
 <?php
 use OpenTelemetry\Context\Context;
diff --git a/tests/Integration/SDK/TracerTest.php b/tests/Integration/SDK/TracerTest.php
index e0596e13c..821caf295 100644
--- a/tests/Integration/SDK/TracerTest.php
+++ b/tests/Integration/SDK/TracerTest.php
@@ -9,9 +9,9 @@
 use OpenTelemetry\API\Trace\NonRecordingSpan;
 use OpenTelemetry\API\Trace\SpanContext;
 use OpenTelemetry\API\Trace\TraceState;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Context;
 use OpenTelemetry\SDK\Common\Attribute\AttributesInterface;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Trace\Sampler\AlwaysOffSampler;
 use OpenTelemetry\SDK\Trace\SamplerInterface;
 use OpenTelemetry\SDK\Trace\SamplingResult;
diff --git a/tests/Unit/API/Instrumentation/ConfigurationResolverTest.php b/tests/Unit/API/Instrumentation/ConfigurationResolverTest.php
deleted file mode 100644
index 4b7a24c9c..000000000
--- a/tests/Unit/API/Instrumentation/ConfigurationResolverTest.php
+++ /dev/null
@@ -1,123 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace OpenTelemetry\Tests\Unit\API\Instrumentation;
-
-use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
-use OpenTelemetry\API\Instrumentation\ConfigurationResolver;
-use PHPUnit\Framework\TestCase;
-
-/**
- * @covers \OpenTelemetry\API\Instrumentation\ConfigurationResolver
- */
-class ConfigurationResolverTest extends TestCase
-{
-    use EnvironmentVariables;
-
-    private ConfigurationResolver $resolver;
-
-    public function setUp(): void
-    {
-        $this->resolver = new ConfigurationResolver();
-    }
-
-    public function tearDown(): void
-    {
-        $this->restoreEnvironmentVariables();
-    }
-
-    /**
-     * @dataProvider hasProvider
-     */
-    public function test_has(?string $value, bool $expected): void
-    {
-        $this->assertFalse($this->resolver->has('OTEL_FOO'));
-        $this->setEnvironmentVariable('OTEL_FOO', $value);
-        $this->assertSame($expected, $this->resolver->has('OTEL_FOO'));
-    }
-
-    public static function hasProvider(): array
-    {
-        return [
-            ['bar', true],
-            ['', false],
-            [null, false],
-        ];
-    }
-
-    public function test_get_string(): void
-    {
-        $this->assertFalse($this->resolver->has('OTEL_FOO'));
-        $this->setEnvironmentVariable('OTEL_FOO', 'bar');
-        $this->assertSame('bar', $this->resolver->getString('OTEL_FOO'));
-    }
-
-    /**
-     * @dataProvider booleanProvider
-     */
-    public function test_get_boolean(?string $value, ?bool $expected): void
-    {
-        $this->assertFalse($this->resolver->has('OTEL_FOO'));
-        $this->setEnvironmentVariable('OTEL_FOO', $value);
-        $this->assertSame($expected, $this->resolver->getBoolean('OTEL_FOO'));
-    }
-
-    public static function booleanProvider(): array
-    {
-        return [
-            ['true', true],
-            ['false', false],
-            ['random', false],
-            ['', null],
-            [null, null],
-        ];
-    }
-
-    /**
-     * @dataProvider intProvider
-     */
-    public function test_get_int(?string $value, ?int $expected): void
-    {
-        $this->assertFalse($this->resolver->has('OTEL_FOO'));
-        $this->setEnvironmentVariable('OTEL_FOO', $value);
-        $this->assertSame($expected, $this->resolver->getInt('OTEL_FOO'));
-    }
-
-    public static function intProvider(): array
-    {
-        return [
-            ['0', 0],
-            ['1', 1],
-            ['-1', -1],
-            ['', null],
-            [null, null],
-            ['3.14159', null],
-        ];
-    }
-
-    /**
-     * @dataProvider listProvider
-     */
-    public function test_get_list(?string $value, array $expected): void
-    {
-        $this->assertFalse($this->resolver->has('OTEL_FOO'));
-        $this->setEnvironmentVariable('OTEL_FOO', $value);
-        $this->assertSame($expected, $this->resolver->getList('OTEL_FOO'));
-    }
-
-    public static function listProvider(): array
-    {
-        return [
-            ['foo,bar,baz', ['foo','bar','baz']],
-            ['foo', ['foo']],
-            ['', []],
-            [null, []],
-        ];
-    }
-
-    public function test_has_when_missing(): void
-    {
-        $this->assertFalse($this->resolver->has('OTEL_MISSING'));
-    }
-}
diff --git a/tests/Unit/Config/Configuration/Accessor/PhpIniAccessorTest.php b/tests/Unit/Config/Configuration/Accessor/PhpIniAccessorTest.php
new file mode 100644
index 000000000..be31e6885
--- /dev/null
+++ b/tests/Unit/Config/Configuration/Accessor/PhpIniAccessorTest.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Accessor;
+
+use OpenTelemetry\Config\Configuration\Accessor\PhpIniAccessor;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @covers \OpenTelemetry\Config\Configuration\Accessor\PhpIniAccessor
+ */
+class PhpIniAccessorTest extends TestCase
+{
+    public function test_access(): void
+    {
+        $accessor = new PhpIniAccessor();
+        $value = $accessor->get('assert.active');
+
+        /** @psalm-suppress RedundantCondition */
+        $this->assertNotNull($value);
+    }
+}
diff --git a/tests/Unit/SDK/Common/Configuration/ConfigurationTest.php b/tests/Unit/Config/Configuration/ConfigurationTest.php
similarity index 69%
rename from tests/Unit/SDK/Common/Configuration/ConfigurationTest.php
rename to tests/Unit/Config/Configuration/ConfigurationTest.php
index 994186782..ffde6385c 100644
--- a/tests/Unit/SDK/Common/Configuration/ConfigurationTest.php
+++ b/tests/Unit/Config/Configuration/ConfigurationTest.php
@@ -2,80 +2,79 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
 use Exception;
 use Generator;
-use OpenTelemetry\SDK\Common\Configuration\Configuration;
-use OpenTelemetry\SDK\Common\Configuration\Defaults;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
-use OpenTelemetry\SDK\Common\Configuration\VariableTypes;
+use OpenTelemetry\Config\Configuration\Configuration;
+use OpenTelemetry\Config\Configuration\Defaults;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use PHPUnit\Framework\TestCase;
 use UnexpectedValueException;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Configuration
+ * @covers \OpenTelemetry\Config\Configuration\Configuration
  */
 class ConfigurationTest extends TestCase
 {
     use EnvironmentVariables;
 
     private const ALLOW_EMPTY = [
-        VariableTypes::LIST,
-        VariableTypes::MAP,
-        VariableTypes::MIXED,
+        'list',
+        'map',
+        'mixed',
     ];
 
     private const METHOD_NAMES = [
-        VariableTypes::STRING => ['getString'],
-        VariableTypes::BOOL => ['getBoolean'],
-        VariableTypes::INTEGER => ['getInt'],
-        VariableTypes::FLOAT => ['getFloat'],
-        VariableTypes::RATIO => ['getRatio'],
-        VariableTypes::ENUM => ['getEnum'],
-        VariableTypes::LIST => ['getList'],
-        VariableTypes::MAP => ['getMap'],
-        VariableTypes::MIXED => ['getMixed'],
+        'string' => ['getString'],
+        'bool' => ['getBoolean'],
+        'integer' => ['getInt'],
+        'float' => ['getFloat'],
+        'ratio' => ['getRatio'],
+        'enum' => ['getEnum'],
+        'list' => ['getList'],
+        'map' => ['getMap'],
+        'mixed' => ['getMixed'],
     ];
 
     private const TYPES = [
-        VariableTypes::STRING => [Variables::OTEL_SERVICE_NAME],
-        VariableTypes::BOOL => [Variables::OTEL_EXPORTER_OTLP_INSECURE],
-        VariableTypes::INTEGER => [Variables::OTEL_BSP_MAX_QUEUE_SIZE],
-        VariableTypes::ENUM => [Variables::OTEL_LOG_LEVEL],
-        VariableTypes::LIST => [Variables::OTEL_PROPAGATORS],
-        VariableTypes::MAP => [Variables::OTEL_RESOURCE_ATTRIBUTES],
-        VariableTypes::MIXED => [Variables::OTEL_TRACES_SAMPLER_ARG],
+        'string' => [Variables::OTEL_SERVICE_NAME],
+        'bool' => [Variables::OTEL_EXPORTER_OTLP_INSECURE],
+        'integer' => [Variables::OTEL_BSP_MAX_QUEUE_SIZE],
+        'enum' => [Variables::OTEL_LOG_LEVEL],
+        'list' => [Variables::OTEL_PROPAGATORS],
+        'map' => [Variables::OTEL_RESOURCE_ATTRIBUTES],
+        'mixed' => [Variables::OTEL_TRACES_SAMPLER_ARG],
     ];
 
     private const USER_VALUES = [
-        VariableTypes::STRING => ['foo', 'foo'],
-        VariableTypes::BOOL => ['true', true],
-        VariableTypes::INTEGER => ['42', 42],
-        VariableTypes::ENUM => ['val1', 'val1'],
-        VariableTypes::LIST => [['val1', 'val2'], ['val1','val2']],
-        VariableTypes::MAP => [['var1' => 'val1', 'var2' => 'val2'], ['var1'=>'val1','var2'=>'val2']],
-        VariableTypes::MIXED => ['foo', 'foo'],
+        'string' => ['foo', 'foo'],
+        'bool' => ['true', true],
+        'integer' => ['42', 42],
+        'enum' => ['val1', 'val1'],
+        'list' => [['val1', 'val2'], ['val1','val2']],
+        'map' => [['var1' => 'val1', 'var2' => 'val2'], ['var1'=>'val1','var2'=>'val2']],
+        'mixed' => ['foo', 'foo'],
     ];
 
     private const USER_ENV_VALUES = [
-        VariableTypes::STRING => ['foo', 'foo'],
-        VariableTypes::BOOL => ['true', true],
-        VariableTypes::INTEGER => ['42', 42],
-        VariableTypes::ENUM => ['val1', 'val1'],
-        VariableTypes::LIST => ['val1,val2', ['val1','val2']],
-        VariableTypes::MAP => ['var1=val1,var2=val2', ['var1'=>'val1','var2'=>'val2']],
-        VariableTypes::MIXED => ['foo', 'foo'],
+        'string' => ['foo', 'foo'],
+        'bool' => ['true', true],
+        'integer' => ['42', 42],
+        'enum' => ['val1', 'val1'],
+        'list' => ['val1,val2', ['val1','val2']],
+        'map' => ['var1=val1,var2=val2', ['var1'=>'val1','var2'=>'val2']],
+        'mixed' => ['foo', 'foo'],
     ];
 
     private const LIBRARY_DEFAULTS = [
-        VariableTypes::STRING => [Variables::OTEL_EXPORTER_OTLP_ENDPOINT, 'http://localhost:4318'],
-        VariableTypes::BOOL => [Variables::OTEL_EXPORTER_OTLP_INSECURE, false],
-        VariableTypes::INTEGER => [Variables::OTEL_BSP_MAX_QUEUE_SIZE, 2048],
-        VariableTypes::ENUM => [Variables::OTEL_LOG_LEVEL, 'info'],
-        VariableTypes::LIST => [Variables::OTEL_PROPAGATORS, ['tracecontext', 'baggage']],
+        'string' => [Variables::OTEL_EXPORTER_OTLP_ENDPOINT, 'http://localhost:4318'],
+        'bool' => [Variables::OTEL_EXPORTER_OTLP_INSECURE, false],
+        'integer' => [Variables::OTEL_BSP_MAX_QUEUE_SIZE, 2048],
+        'enum' => [Variables::OTEL_LOG_LEVEL, 'info'],
+        'list' => [Variables::OTEL_PROPAGATORS, ['tracecontext', 'baggage']],
     ];
 
     private const DEFAULT_VALUES = [
@@ -85,10 +84,10 @@ class ConfigurationTest extends TestCase
     ];
 
     private const NO_DEFAULTS = [
-        VariableTypes::STRING => [Variables::OTEL_SERVICE_NAME],
-        VariableTypes::ENUM => [Variables::OTEL_EXPORTER_OTLP_COMPRESSION],
-        VariableTypes::MAP => [Variables::OTEL_EXPORTER_OTLP_HEADERS],
-        VariableTypes::MIXED => [Variables::OTEL_TRACES_SAMPLER_ARG],
+        'string' => [Variables::OTEL_SERVICE_NAME],
+        'enum' => [Variables::OTEL_EXPORTER_OTLP_COMPRESSION],
+        'map' => [Variables::OTEL_EXPORTER_OTLP_HEADERS],
+        'mixed' => [Variables::OTEL_TRACES_SAMPLER_ARG],
     ];
 
     private const KNOWN_VALUES = [
@@ -262,16 +261,6 @@ public function test_no_value_throws_exception(string $methodName): void
         call_user_func([Configuration::class, $methodName], 'FOO_BAR_' . $methodName);
     }
 
-    /**
-     * @dataProvider invalidTypeProvider
-     */
-    public function test_invalid_type_throws_exception(string $methodName, string $variable): void
-    {
-        $this->expectException(UnexpectedValueException::class);
-
-        call_user_func([Configuration::class, $methodName], $variable);
-    }
-
     /**
      * @dataProvider noDefaultProvider
      */
@@ -334,24 +323,6 @@ public static function nonEmptyMethodNameProvider(): Generator
         }
     }
 
-    public static function invalidTypeProvider(): Generator
-    {
-        foreach (self::METHOD_NAMES as $varType => $names) {
-            if ($varType === VariableTypes::MIXED) {
-                continue;
-            }
-            $methodName = $names[0];
-            foreach (self::TYPES as $methodType => $types) {
-                if ($varType === $methodType || $methodType === VariableTypes::MIXED) {
-                    continue;
-                }
-                $variableName = $types[0];
-
-                yield sprintf('%s - %s', $varType, $methodType) => [$methodName, $variableName];
-            }
-        }
-    }
-
     public static function noDefaultProvider(): Generator
     {
         foreach (self::NO_DEFAULTS as $varType => $values) {
@@ -400,30 +371,6 @@ public function test_retrieve_value_library_default(): void
         );
     }
 
-    /**
-     * @dataProvider typeProvider
-     */
-    public function test_get_type(string $varName, string $type): void
-    {
-        $this->assertSame(
-            $type,
-            Configuration::getType($varName)
-        );
-    }
-
-    public static function typeProvider(): array
-    {
-        return [
-            'bool' => ['OTEL_EXPORTER_OTLP_INSECURE', VariableTypes::BOOL],
-            'string' => ['OTEL_SERVICE_NAME', VariableTypes::STRING],
-            'integer' => ['OTEL_BSP_MAX_QUEUE_SIZE', VariableTypes::INTEGER],
-            'enum' => ['OTEL_LOG_LEVEL', VariableTypes::ENUM],
-            'list' => ['OTEL_PROPAGATORS', VariableTypes::LIST],
-            'map' => ['OTEL_RESOURCE_ATTRIBUTES', VariableTypes::MAP],
-            'mixed' => ['OTEL_TRACES_SAMPLER_ARG', VariableTypes::MIXED],
-        ];
-    }
-
     /**
      * @dataProvider defaultValueProvider
      */
diff --git a/tests/Unit/SDK/Common/Configuration/Parser/BooleanParserTest.php b/tests/Unit/Config/Configuration/Parser/BooleanParserTest.php
similarity index 81%
rename from tests/Unit/SDK/Common/Configuration/Parser/BooleanParserTest.php
rename to tests/Unit/Config/Configuration/Parser/BooleanParserTest.php
index 97fde7e44..8fa7883e8 100644
--- a/tests/Unit/SDK/Common/Configuration/Parser/BooleanParserTest.php
+++ b/tests/Unit/Config/Configuration/Parser/BooleanParserTest.php
@@ -2,14 +2,14 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Parser;
 
 use InvalidArgumentException;
-use OpenTelemetry\SDK\Common\Configuration\Parser\BooleanParser;
+use OpenTelemetry\Config\Configuration\Parser\BooleanParser;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Parser\BooleanParser
+ * @covers \OpenTelemetry\Config\Configuration\Parser\BooleanParser
  */
 class BooleanParserTest extends TestCase
 {
@@ -100,4 +100,20 @@ public static function nonBooleanValueProvider(): array
     {
         return self::NON_BOOLEAN_VALUES;
     }
+
+    /**
+     * @dataProvider boolProvider
+     */
+    public function test_boolean(bool $bool): void
+    {
+        $this->assertSame($bool, BooleanParser::parse($bool));
+    }
+
+    public static function boolProvider(): array
+    {
+        return [
+            [true],
+            [false],
+        ];
+    }
 }
diff --git a/tests/Unit/SDK/Common/Configuration/Parser/ListParserTest.php b/tests/Unit/Config/Configuration/Parser/ListParserTest.php
similarity index 67%
rename from tests/Unit/SDK/Common/Configuration/Parser/ListParserTest.php
rename to tests/Unit/Config/Configuration/Parser/ListParserTest.php
index 17eb7a834..2a6a66149 100644
--- a/tests/Unit/SDK/Common/Configuration/Parser/ListParserTest.php
+++ b/tests/Unit/Config/Configuration/Parser/ListParserTest.php
@@ -2,12 +2,13 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Parser;
 
+use OpenTelemetry\Config\Configuration\Parser\ListParser;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Parser\ListParser
+ * @covers \OpenTelemetry\Config\Configuration\Parser\ListParser
  */
 class ListParserTest extends TestCase
 {
@@ -32,15 +33,19 @@ class ListParserTest extends TestCase
             'foo, bar , faz, baz',
             ['foo', 'bar', 'faz', 'baz'],
         ],
+        'array' => [
+            ['foo', 'bar'],
+            ['foo', 'bar'],
+        ],
     ];
 
     /**
      * @dataProvider listValueProvider
      */
-    public function test_comma_separated_list_returns_array(string $value, array $expected): void
+    public function test_comma_separated_list_returns_array(mixed $value, array $expected): void
     {
         $this->assertSame(
-            \OpenTelemetry\SDK\Common\Configuration\Parser\ListParser::parse($value),
+            ListParser::parse($value),
             $expected
         );
     }
diff --git a/tests/Unit/SDK/Common/Configuration/Parser/MapParserTest.php b/tests/Unit/Config/Configuration/Parser/MapParserTest.php
similarity index 76%
rename from tests/Unit/SDK/Common/Configuration/Parser/MapParserTest.php
rename to tests/Unit/Config/Configuration/Parser/MapParserTest.php
index 85f8f941f..4164f6dc0 100644
--- a/tests/Unit/SDK/Common/Configuration/Parser/MapParserTest.php
+++ b/tests/Unit/Config/Configuration/Parser/MapParserTest.php
@@ -2,13 +2,14 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Parser;
 
 use InvalidArgumentException;
+use OpenTelemetry\Config\Configuration\Parser\MapParser;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Parser\MapParser
+ * @covers \OpenTelemetry\Config\Configuration\Parser\MapParser
  */
 class MapParserTest extends TestCase
 {
@@ -33,6 +34,10 @@ class MapParserTest extends TestCase
             'Authorization=Basic 1234abc=,bar=baz',
             ['Authorization' => 'Basic 1234abc=', 'bar' => 'baz'],
         ],
+        'array' => [
+            ['foo' => 'foo', 'bar' => 'bar'],
+            ['foo' => 'foo', 'bar' => 'bar'],
+        ],
     ];
 
     private const INVALID_VALUES = [
@@ -43,10 +48,10 @@ class MapParserTest extends TestCase
     /**
      * @dataProvider mapValueProvider
      */
-    public function test_map_values_return_array(string $value, array $expected): void
+    public function test_map_values_return_array(string|array $value, array $expected): void
     {
         $this->assertSame(
-            \OpenTelemetry\SDK\Common\Configuration\Parser\MapParser::parse($value),
+            MapParser::parse($value),
             $expected
         );
     }
@@ -58,7 +63,7 @@ public function test_invalid_values_throw_exception(string $value): void
     {
         $this->expectException(InvalidArgumentException::class);
 
-        \OpenTelemetry\SDK\Common\Configuration\Parser\MapParser::parse($value);
+        MapParser::parse($value);
     }
 
     public static function mapValueProvider(): array
diff --git a/tests/Unit/SDK/Common/Configuration/Parser/RatioParserTest.php b/tests/Unit/Config/Configuration/Parser/RatioParserTest.php
similarity index 88%
rename from tests/Unit/SDK/Common/Configuration/Parser/RatioParserTest.php
rename to tests/Unit/Config/Configuration/Parser/RatioParserTest.php
index 36300225b..4345d8dba 100644
--- a/tests/Unit/SDK/Common/Configuration/Parser/RatioParserTest.php
+++ b/tests/Unit/Config/Configuration/Parser/RatioParserTest.php
@@ -2,15 +2,15 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Parser;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Parser;
 
 use InvalidArgumentException;
-use OpenTelemetry\SDK\Common\Configuration\Parser\RatioParser;
+use OpenTelemetry\Config\Configuration\Parser\RatioParser;
 use PHPUnit\Framework\TestCase;
 use RangeException;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Parser\RatioParser
+ * @covers \OpenTelemetry\Config\Configuration\Parser\RatioParser
  */
 class RatioParserTest extends TestCase
 {
diff --git a/tests/Unit/SDK/Common/Configuration/Resolver/CompositeResolverTest.php b/tests/Unit/Config/Configuration/Resolver/CompositeResolverTest.php
similarity index 83%
rename from tests/Unit/SDK/Common/Configuration/Resolver/CompositeResolverTest.php
rename to tests/Unit/Config/Configuration/Resolver/CompositeResolverTest.php
index 74d8d5c0f..2018074c2 100644
--- a/tests/Unit/SDK/Common/Configuration/Resolver/CompositeResolverTest.php
+++ b/tests/Unit/Config/Configuration/Resolver/CompositeResolverTest.php
@@ -2,22 +2,23 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Resolver;
 
-use OpenTelemetry\SDK\Common\Configuration\Defaults;
-use OpenTelemetry\SDK\Common\Configuration\Resolver\CompositeResolver;
-use OpenTelemetry\SDK\Common\Configuration\Resolver\ResolverInterface;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Defaults;
+use OpenTelemetry\Config\Configuration\Resolver\CompositeResolver;
+use OpenTelemetry\Config\Configuration\Resolver\ResolverInterface;
+use OpenTelemetry\Config\Configuration\Variables;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Resolver\CompositeResolver
+ * @covers \OpenTelemetry\Config\Configuration\Resolver\CompositeResolver
  * @psalm-suppress UndefinedInterfaceMethod
  */
 class CompositeResolverTest extends TestCase
 {
-    private ResolverInterface $one;
-    private ResolverInterface $two;
+    private ResolverInterface&MockObject $one;
+    private ResolverInterface&MockObject $two;
     private CompositeResolver $resolver;
 
     public function setUp(): void
diff --git a/tests/Unit/SDK/Common/Configuration/Resolver/EnvironmentResolverTest.php b/tests/Unit/Config/Configuration/Resolver/EnvironmentResolverTest.php
similarity index 92%
rename from tests/Unit/SDK/Common/Configuration/Resolver/EnvironmentResolverTest.php
rename to tests/Unit/Config/Configuration/Resolver/EnvironmentResolverTest.php
index 280c21476..8807b74d4 100644
--- a/tests/Unit/SDK/Common/Configuration/Resolver/EnvironmentResolverTest.php
+++ b/tests/Unit/Config/Configuration/Resolver/EnvironmentResolverTest.php
@@ -2,14 +2,14 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Resolver;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
-use OpenTelemetry\SDK\Common\Configuration\Resolver\EnvironmentResolver;
+use OpenTelemetry\Config\Configuration\Resolver\EnvironmentResolver;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Resolver\EnvironmentResolver
+ * @covers \OpenTelemetry\Config\Configuration\Resolver\EnvironmentResolver
  */
 class EnvironmentResolverTest extends TestCase
 {
diff --git a/tests/Unit/SDK/Common/Configuration/Resolver/PhpIniResolverTest.php b/tests/Unit/Config/Configuration/Resolver/PhpIniResolverTest.php
similarity index 77%
rename from tests/Unit/SDK/Common/Configuration/Resolver/PhpIniResolverTest.php
rename to tests/Unit/Config/Configuration/Resolver/PhpIniResolverTest.php
index 33b7489fc..c276e5691 100644
--- a/tests/Unit/SDK/Common/Configuration/Resolver/PhpIniResolverTest.php
+++ b/tests/Unit/Config/Configuration/Resolver/PhpIniResolverTest.php
@@ -2,19 +2,20 @@
 
 declare(strict_types=1);
 
-namespace OpenTelemetry\Tests\Unit\SDK\Common\Configuration\Resolver;
+namespace OpenTelemetry\Tests\Unit\Config\Configuration\Resolver;
 
-use OpenTelemetry\SDK\Common\Configuration\Resolver\PhpIniAccessor;
-use OpenTelemetry\SDK\Common\Configuration\Resolver\PhpIniResolver;
+use OpenTelemetry\Config\Configuration\Accessor\PhpIniAccessor;
+use OpenTelemetry\Config\Configuration\Resolver\PhpIniResolver;
+use PHPUnit\Framework\MockObject\MockObject;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Configuration\Resolver\PhpIniResolver
+ * @covers \OpenTelemetry\Config\Configuration\Resolver\PhpIniResolver
  * @psalm-suppress UndefinedMethod
  */
 class PhpIniResolverTest extends TestCase
 {
-    private PhpIniAccessor $accessor;
+    private PhpIniAccessor&MockObject $accessor;
     private PhpIniResolver $resolver;
 
     public function setUp(): void
@@ -50,7 +51,7 @@ public static function hasVariableProvider(): array
             'string' => ['foo', true],
             'array' => [['foo'], true],
             'empty string' => ['', false],
-            'null' => [null, false],
+            'false' => [false, false],
             'empty array' => [[], false],
         ];
     }
diff --git a/tests/Unit/Context/ContextTest.php b/tests/Unit/Context/ContextTest.php
index b023300a4..44b730c33 100644
--- a/tests/Unit/Context/ContextTest.php
+++ b/tests/Unit/Context/ContextTest.php
@@ -4,6 +4,8 @@
 
 namespace OpenTelemetry\Tests\Unit\Context;
 
+use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Context;
 use OpenTelemetry\Context\ContextKeys;
 use OpenTelemetry\Context\DebugScope;
@@ -16,6 +18,14 @@
  */
 class ContextTest extends TestCase
 {
+    use EnvironmentVariables;
+
+    public function tearDown(): void
+    {
+        $this->restoreEnvironmentVariables();
+        unset($_SERVER[Variables::OTEL_PHP_DEBUG_SCOPES_DISABLED]);
+    }
+
     public function test_activate(): void
     {
         $context = Context::getRoot();
@@ -179,87 +189,31 @@ public function test_attach_and_detach_set_current_ctx(): void
         }
     }
 
-    public function test_debug_scopes_disabled_env_var(): void
+    public function test_debug_scopes_disabled(): void
     {
-        \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED=1');
+        $this->setEnvironmentVariable(Variables::OTEL_PHP_DEBUG_SCOPES_DISABLED, 'true');
 
         $context = Context::getRoot();
-
         $scope = $context->activate();
 
         try {
             $this->assertNotInstanceOf(DebugScope::class, $scope);
         } finally {
             $scope->detach();
-            \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED');
         }
     }
 
-    public function test_debug_scopes_disabled_server_var(): void
+    public function test_debug_scopes_disabled_false(): void
     {
-        $_SERVER['OTEL_PHP_DEBUG_SCOPES_DISABLED'] = '1';
+        $this->setEnvironmentVariable(Variables::OTEL_PHP_DEBUG_SCOPES_DISABLED, 'false');
 
         $context = Context::getRoot();
-
-        $scope = $context->activate();
-
-        try {
-            $this->assertNotInstanceOf(DebugScope::class, $scope);
-        } finally {
-            $scope->detach();
-            unset($_SERVER['OTEL_PHP_DEBUG_SCOPES_DISABLED']);
-        }
-    }
-
-    public function test_debug_scopes_disabled_order_server(): void
-    {
-        $_SERVER['OTEL_PHP_DEBUG_SCOPES_DISABLED'] = '1';
-        \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED=0');
-
-        $context = Context::getRoot();
-
-        $scope = $context->activate();
-
-        try {
-            $this->assertNotInstanceOf(DebugScope::class, $scope);
-        } finally {
-            $scope->detach();
-            unset($_SERVER['OTEL_PHP_DEBUG_SCOPES_DISABLED']);
-            \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED');
-        }
-    }
-
-    public function test_debug_scopes_disabled_falsey_server(): void
-    {
-        $_SERVER['OTEL_PHP_DEBUG_SCOPES_DISABLED'] = '0';
-        \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED=1');
-
-        $context = Context::getRoot();
-
-        $scope = $context->activate();
-
-        try {
-            $this->assertInstanceOf(DebugScope::class, $scope);
-        } finally {
-            $scope->detach();
-            unset($_SERVER['OTEL_PHP_DEBUG_SCOPES_DISABLED']);
-            \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED');
-        }
-    }
-
-    public function test_debug_scopes_disabled_falsey_env(): void
-    {
-        \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED=0');
-
-        $context = Context::getRoot();
-
         $scope = $context->activate();
 
         try {
             $this->assertInstanceOf(DebugScope::class, $scope);
         } finally {
             $scope->detach();
-            \putenv('OTEL_PHP_DEBUG_SCOPES_DISABLED');
         }
     }
 }
diff --git a/tests/Unit/Contrib/Otlp/LogsExporterFactoryTest.php b/tests/Unit/Contrib/Otlp/LogsExporterFactoryTest.php
index eab64311a..2c5375963 100644
--- a/tests/Unit/Contrib/Otlp/LogsExporterFactoryTest.php
+++ b/tests/Unit/Contrib/Otlp/LogsExporterFactoryTest.php
@@ -5,9 +5,9 @@
 namespace OpenTelemetry\Tests\Unit\Contrib\Otlp;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Contrib\Otlp\LogsExporterFactory;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
 use OpenTelemetry\SDK\Common\Export\TransportInterface;
 use PHPUnit\Framework\MockObject\MockObject;
diff --git a/tests/Unit/Contrib/Otlp/MetricExporterFactoryTest.php b/tests/Unit/Contrib/Otlp/MetricExporterFactoryTest.php
index fc9f406ba..1e5329f56 100644
--- a/tests/Unit/Contrib/Otlp/MetricExporterFactoryTest.php
+++ b/tests/Unit/Contrib/Otlp/MetricExporterFactoryTest.php
@@ -5,9 +5,9 @@
 namespace OpenTelemetry\Tests\Unit\Contrib\Otlp;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Contrib\Otlp\MetricExporterFactory;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
 use OpenTelemetry\SDK\Common\Export\TransportInterface;
 use OpenTelemetry\SDK\Metrics\AggregationTemporalitySelectorInterface;
diff --git a/tests/Unit/Contrib/Otlp/OtlpUtilTest.php b/tests/Unit/Contrib/Otlp/OtlpUtilTest.php
index 8b22c6383..c02b98323 100644
--- a/tests/Unit/Contrib/Otlp/OtlpUtilTest.php
+++ b/tests/Unit/Contrib/Otlp/OtlpUtilTest.php
@@ -6,8 +6,8 @@
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
 use OpenTelemetry\API\Signals;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Contrib\Otlp\OtlpUtil;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use PHPUnit\Framework\TestCase;
 
 /**
diff --git a/tests/Unit/Contrib/Otlp/SpanExporterFactoryTest.php b/tests/Unit/Contrib/Otlp/SpanExporterFactoryTest.php
index af39021fb..620ffde15 100644
--- a/tests/Unit/Contrib/Otlp/SpanExporterFactoryTest.php
+++ b/tests/Unit/Contrib/Otlp/SpanExporterFactoryTest.php
@@ -5,9 +5,9 @@
 namespace OpenTelemetry\Tests\Unit\Contrib\Otlp;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Contrib\Otlp\SpanExporterFactory;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Common\Export\TransportFactoryInterface;
 use OpenTelemetry\SDK\Common\Export\TransportInterface;
 use PHPUnit\Framework\TestCase;
diff --git a/tests/Unit/SDK/Common/Util/ClassConstantAccessorTest.php b/tests/Unit/SDK/Common/Util/ClassConstantAccessorTest.php
index 801d25253..9b90a3732 100644
--- a/tests/Unit/SDK/Common/Util/ClassConstantAccessorTest.php
+++ b/tests/Unit/SDK/Common/Util/ClassConstantAccessorTest.php
@@ -5,11 +5,11 @@
 namespace OpenTelemetry\Tests\Unit\SDK\Common\Util;
 
 use LogicException;
-use OpenTelemetry\SDK\Common\Util\ClassConstantAccessor;
+use OpenTelemetry\Config\Configuration\Accessor\ClassConstantAccessor;
 use PHPUnit\Framework\TestCase;
 
 /**
- * @covers \OpenTelemetry\SDK\Common\Util\ClassConstantAccessor
+ * @covers \OpenTelemetry\Config\Configuration\Accessor\ClassConstantAccessor
  */
 class ClassConstantAccessorTest extends TestCase
 {
diff --git a/tests/Unit/SDK/Logs/LogRecordProcessorFactoryTest.php b/tests/Unit/SDK/Logs/LogRecordProcessorFactoryTest.php
index 3154066fd..22d14f673 100644
--- a/tests/Unit/SDK/Logs/LogRecordProcessorFactoryTest.php
+++ b/tests/Unit/SDK/Logs/LogRecordProcessorFactoryTest.php
@@ -5,7 +5,7 @@
 namespace OpenTelemetry\Tests\Unit\SDK\Logs;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Logs\LogRecordExporterInterface;
 use OpenTelemetry\SDK\Logs\LogRecordProcessorFactory;
 use OpenTelemetry\SDK\Logs\Processor\BatchLogRecordProcessor;
diff --git a/tests/Unit/SDK/Metrics/MeterProviderFactoryTest.php b/tests/Unit/SDK/Metrics/MeterProviderFactoryTest.php
index c6370bb15..fd5ec0936 100644
--- a/tests/Unit/SDK/Metrics/MeterProviderFactoryTest.php
+++ b/tests/Unit/SDK/Metrics/MeterProviderFactoryTest.php
@@ -7,8 +7,8 @@
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
 use OpenTelemetry\API\LoggerHolder;
 use OpenTelemetry\API\Metrics\MeterInterface;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\SDK\Metrics\MeterProviderFactory;
 use PHPUnit\Framework\TestCase;
 use Psr\Log\NullLogger;
diff --git a/tests/Unit/SDK/Propagation/PropagatorFactoryTest.php b/tests/Unit/SDK/Propagation/PropagatorFactoryTest.php
index 67fdb4f91..b9522d0b6 100644
--- a/tests/Unit/SDK/Propagation/PropagatorFactoryTest.php
+++ b/tests/Unit/SDK/Propagation/PropagatorFactoryTest.php
@@ -8,14 +8,14 @@
 use OpenTelemetry\API\Baggage\Propagation\BaggagePropagator;
 use OpenTelemetry\API\LoggerHolder;
 use OpenTelemetry\API\Trace\Propagation\TraceContextPropagator;
+use OpenTelemetry\Config\Configuration\KnownValues;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Propagation\MultiTextMapPropagator;
 use OpenTelemetry\Context\Propagation\NoopTextMapPropagator;
 use OpenTelemetry\Extension\Propagator\B3\B3Propagator;
 use OpenTelemetry\Extension\Propagator\CloudTrace\CloudTracePropagator;
 use OpenTelemetry\Extension\Propagator\Jaeger\JaegerBaggagePropagator;
 use OpenTelemetry\Extension\Propagator\Jaeger\JaegerPropagator;
-use OpenTelemetry\SDK\Common\Configuration\KnownValues;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Propagation\PropagatorFactory;
 use PHPUnit\Framework\TestCase;
 use Psr\Log\NullLogger;
diff --git a/tests/Unit/SDK/SdkAutoloaderTest.php b/tests/Unit/SDK/SdkAutoloaderTest.php
index e053cc0f5..6fd6aedea 100644
--- a/tests/Unit/SDK/SdkAutoloaderTest.php
+++ b/tests/Unit/SDK/SdkAutoloaderTest.php
@@ -10,8 +10,8 @@
 use OpenTelemetry\API\Logs\NoopLoggerProvider;
 use OpenTelemetry\API\Metrics\Noop\NoopMeterProvider;
 use OpenTelemetry\API\Trace\NoopTracerProvider;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Propagation\NoopTextMapPropagator;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\SdkAutoloader;
 use PHPUnit\Framework\TestCase;
 use Psr\Log\NullLogger;
diff --git a/tests/Unit/SDK/SdkTest.php b/tests/Unit/SDK/SdkTest.php
index 4eff6943f..bc21518f1 100644
--- a/tests/Unit/SDK/SdkTest.php
+++ b/tests/Unit/SDK/SdkTest.php
@@ -5,8 +5,8 @@
 namespace OpenTelemetry\Tests\Unit\SDK;
 
 use AssertWell\PHPUnitGlobalState\EnvironmentVariables;
+use OpenTelemetry\Config\Configuration\Variables;
 use OpenTelemetry\Context\Propagation\TextMapPropagatorInterface;
-use OpenTelemetry\SDK\Common\Configuration\Variables;
 use OpenTelemetry\SDK\Logs\LoggerProviderInterface;
 use OpenTelemetry\SDK\Metrics\MeterProviderInterface;
 use OpenTelemetry\SDK\Sdk;