diff --git a/core/lib/Drupal/Core/Extension/Requirement/BaseRequirement.php b/core/lib/Drupal/Core/Extension/Requirement/BaseRequirement.php
new file mode 100644
index 0000000000..93ae5d1e13
--- /dev/null
+++ b/core/lib/Drupal/Core/Extension/Requirement/BaseRequirement.php
@@ -0,0 +1,209 @@
+<?php
+
+namespace Drupal\Core\Extension\Requirement;
+
+/**
+ * Provides a Requirement value object.
+ */
+abstract class BaseRequirement implements \ArrayAccess {
+
+  const PHASE_INSTALL = 'install';
+
+  const PHASE_UPDATE = 'update';
+
+  const PHASE_RUNTIME = 'runtime';
+
+  const SEVERITY_INFO = -1;
+
+  const SEVERITY_OK = 0;
+
+  const SEVERITY_WARNING = 1;
+
+  const SEVERITY_ERROR = 2;
+
+  /**
+   * The requirement severity.
+   *
+   * @var int
+   */
+  protected $severity = self::SEVERITY_OK;
+
+  /**
+   * The requirement title.
+   *
+   * @var string
+   */
+  protected $title;
+
+  /**
+   * The requirement value.
+   *
+   * @var string
+   */
+  protected $value;
+
+  /**
+   * The requirement description.
+   *
+   * @var string
+   */
+  protected $description;
+
+  /**
+   * Create a new requirement.
+   *
+   * @return $this
+   */
+  public static function create() {
+    return new static();
+  }
+
+  /**
+   * Gets the severity.
+   *
+   * @return int
+   */
+  public function getSeverity() {
+    return $this->severity;
+  }
+
+  /**
+   * Gets the title.
+   *
+   * @return string
+   */
+  public function getTitle() {
+    return $this->title;
+  }
+
+  /**
+   * Sets the title.
+   *
+   * @param string $title
+   *
+   * @return $this
+   */
+  public function setTitle($title) {
+    $this->title = $title;
+    return $this;
+  }
+
+  /**
+   * Gets the value.
+   *
+   * @return string
+   */
+  public function getValue() {
+    return $this->value;
+  }
+
+  /**
+   * Sets the value.
+   *
+   * @param string $value
+   *
+   * @return $this
+   */
+  public function setValue($value) {
+    $this->value = $value;
+    return $this;
+  }
+
+  /**
+   * Gets the description.
+   *
+   * @return string
+   */
+  public function getDescription() {
+    return $this->description;
+  }
+
+  /**
+   * Sets the description.
+   *
+   * @param string $description
+   *
+   * @return $this
+   */
+  public function setDescription($description) {
+    $this->description = $description;
+    return $this;
+  }
+
+  public function offsetExists($offset) {
+    if (in_array($offset, [
+      'description',
+      'title',
+      'value',
+      'severity',
+    ], TRUE)) {
+      return TRUE;
+    }
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * This is for BC support only.
+   */
+  public function offsetGet($offset) {
+    switch ($offset) {
+      case 'description':
+        return $this->getDescription();
+      case 'title':
+        return $this->getTitle();
+      case 'value':
+        return $this->getValue();
+      case 'severity':
+        return $this->getSeverity();
+      default:
+        return NULL;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * This is for BC support only.
+   */
+  public function offsetSet($offset, $value) {
+    switch ($offset) {
+      case 'description':
+        $this->setDescription($value);
+        return NULL;
+      case 'title':
+        $this->setTitle($value);
+        return NULL;
+      case 'value':
+        $this->setValue($value);
+        return NULL;
+      case 'severity':
+        $this->severity = $value;
+        return NULL;
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   *
+   * This is for BC support only.
+   */
+  public function offsetUnset($offset) {
+    switch ($offset) {
+      case 'description':
+        $this->setDescription(NULL);
+        return NULL;
+      case 'title':
+        $this->setTitle(NULL);
+        return NULL;
+      case 'value':
+        $this->setValue(NULL);
+        return NULL;
+      case 'severity':
+        $this->severity = self::SEVERITY_OK;
+        return NULL;
+    }
+  }
+
+}
diff --git a/core/lib/Drupal/Core/Extension/Requirement/BaseRequirementOk.php b/core/lib/Drupal/Core/Extension/Requirement/BaseRequirementOk.php
new file mode 100644
index 0000000000..e03b0b7095
--- /dev/null
+++ b/core/lib/Drupal/Core/Extension/Requirement/BaseRequirementOk.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Drupal\Core\Extension\Requirement;
+
+/**
+ * Provides a RequirementOk value object.
+ */
+class BaseRequirementOk extends BaseRequirement {
+
+  /**
+   * The severity.
+   *
+   * @var int
+   */
+  protected $severity = self::SEVERITY_OK;
+
+}
diff --git a/core/lib/Drupal/Core/Extension/Requirement/Requirement.php b/core/lib/Drupal/Core/Extension/Requirement/Requirement.php
deleted file mode 100644
index 722c153aa5..0000000000
--- a/core/lib/Drupal/Core/Extension/Requirement/Requirement.php
+++ /dev/null
@@ -1,158 +0,0 @@
-<?php
-
-namespace Drupal\Core\Extension\Requirement;
-
-/**
- * Provides a Requirement value object.
- */
-class Requirement implements \ArrayAccess {
-
-  const PHASE_INSTALL = 'install';
-
-  const PHASE_UPDATE = 'update';
-
-  const PHASE_RUNTIME = 'runtime';
-
-  const SEVERITY_INFO = -1;
-
-  const SEVERITY_OK = 0;
-
-  const SEVERITY_WARNING = 1;
-
-  const SEVERITY_ERROR = 2;
-
-  /**
-   * The requirement definition.
-   *
-   * @var array
-   */
-  protected $definition = [];
-
-  /**
-   * Construct a new requirement object.
-   *
-   * @param array $values
-   *   (optional) If given, an array of initial values to set on the definition.
-   */
-  public function __construct(array $values = []) {
-    $this->definition = $values;
-  }
-
-  /**
-   * Create a new requirement.
-   *
-   * @return static
-   *   A new requirementDefinition object.
-   */
-  public static function create() {
-    $definition = [];
-    return new static($definition);
-  }
-
-  /**
-   * Set the title of the requirement.
-   *
-   * @param string $title
-   *   The title.
-   *
-   * @return static
-   *   The object itself for chaining.
-   */
-  public function setTitle($title) {
-    $this->definition['title'] = $title;
-    return $this;
-  }
-
-  /**
-   * Set the current value (e.g., version, time, level, etc).
-   *
-   * During install phase, this should only be used for version numbers, do not
-   * set it if not applicable.
-   *
-   * @param string $value
-   *   The current value.
-   *
-   * @return static
-   *   The object itself for chaining.
-   */
-  public function setValue($value) {
-    $this->definition['value'] = $value;
-    return $this;
-  }
-
-  /**
-   * Set the description of the requirement/status.
-   *
-   * @param string $description
-   *   The description.
-   *
-   * @return static
-   *   The object itself for chaining.
-   */
-  public function setDescription($description) {
-    $this->definition['description'] = $description;
-    return $this;
-  }
-
-  /**
-   * Set the requirement's result/severity level.
-   *
-   * Must be one of:
-   *   - REQUIREMENT_INFO: For info only.
-   *   - REQUIREMENT_OK: The requirement is satisfied.
-   *   - REQUIREMENT_WARNING: The requirement failed with a warning.
-   *   - REQUIREMENT_ERROR: The requirement failed with an error.
-   *
-   * @param string $severity
-   *   The severity.
-   *
-   * @return static
-   *   The object itself for chaining.
-   */
-  public function setSeverity($severity) {
-    $this->definition['severity'] = $severity;
-    return $this;
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * This is for BC support only.
-   */
-  public function offsetExists($offset) {
-    // PHP's array access does not work correctly with isset(), so we have to
-    // bake isset() in here. See https://bugs.php.net/bug.php?id=41727.
-    return array_key_exists($offset, $this->definition) && isset($this->definition[$offset]);
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * This is for BC support only.
-   */
-  public function &offsetGet($offset) {
-    if (!isset($this->definition[$offset])) {
-      $this->definition[$offset] = NULL;
-    }
-    return $this->definition[$offset];
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * This is for BC support only.
-   */
-  public function offsetSet($offset, $value) {
-    $this->definition[$offset] = $value;
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * This is for BC support only.
-   */
-  public function offsetUnset($offset) {
-    unset($this->definition[$offset]);
-  }
-
-}
diff --git a/core/lib/Drupal/Core/Extension/Requirement/RequirementError.php b/core/lib/Drupal/Core/Extension/Requirement/RequirementError.php
new file mode 100644
index 0000000000..04e30141b8
--- /dev/null
+++ b/core/lib/Drupal/Core/Extension/Requirement/RequirementError.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Drupal\Core\Extension\Requirement;
+
+/**
+ * Provides a RequirementError value object.
+ */
+class RequirementError extends BaseRequirement {
+
+  /**
+   * The severity.
+   *
+   * @var int
+   */
+  protected $severity = self::SEVERITY_ERROR;
+
+}
diff --git a/core/lib/Drupal/Core/Extension/Requirement/RequirementInfo.php b/core/lib/Drupal/Core/Extension/Requirement/RequirementInfo.php
new file mode 100644
index 0000000000..7b618050b8
--- /dev/null
+++ b/core/lib/Drupal/Core/Extension/Requirement/RequirementInfo.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Drupal\Core\Extension\Requirement;
+
+/**
+ * Provides a RequirementInfo value object.
+ */
+class RequirementInfo extends BaseRequirement {
+
+  /**
+   * The severity.
+   *
+   * @var int
+   */
+  protected $severity = self::SEVERITY_INFO;
+
+}
diff --git a/core/lib/Drupal/Core/Extension/Requirement/RequirementWarning.php b/core/lib/Drupal/Core/Extension/Requirement/RequirementWarning.php
new file mode 100644
index 0000000000..2814070c0d
--- /dev/null
+++ b/core/lib/Drupal/Core/Extension/Requirement/RequirementWarning.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Drupal\Core\Extension\Requirement;
+
+/**
+ * Provides a RequirementWarning value object.
+ */
+class RequirementWarning extends BaseRequirement {
+
+  /**
+   * The severity.
+   *
+   * @var int
+   */
+  protected $severity = self::SEVERITY_WARNING;
+
+}
diff --git a/core/tests/Drupal/Tests/Core/Extension/Requirement/RequirementTest.php b/core/tests/Drupal/Tests/Core/Extension/Requirement/RequirementTest.php
index b4b6beb8a4..72b9aa3e79 100644
--- a/core/tests/Drupal/Tests/Core/Extension/Requirement/RequirementTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/Requirement/RequirementTest.php
@@ -2,11 +2,12 @@
 
 namespace Drupal\Tests\Core\Extension\Requirement;
 
-use Drupal\Core\Extension\Requirement\Requirement;
+use Drupal\Core\Extension\Requirement\BaseRequirement;
+use Drupal\Core\Extension\Requirement\BaseRequirementOk;
 use Drupal\Tests\UnitTestCase;
 
 /**
- * @coversDefaultClass \Drupal\Core\Extension\Requirement\Requirement
+ * @coversDefaultClass \Drupal\Core\Extension\Requirement\BaseRequirement
  *
  * @group Extension
  */
@@ -16,17 +17,16 @@ class RequirementTest extends UnitTestCase {
    * @covers ::create
    */
   public function testCreate() {
-    $requirement = Requirement::create()
+    $requirement = BaseRequirementOk::create()
       ->setTitle("Alice in Wonderland")
       ->setDescription("It's no use going back to yesterday, because I was a different person then.")
-      ->setValue("small")
-      ->setSeverity(Requirement::SEVERITY_WARNING);
+      ->setValue("small");
 
     // Test array access.
     $this->assertEquals("Alice in Wonderland", $requirement['title']);
     $this->assertEquals("It's no use going back to yesterday, because I was a different person then.", $requirement['description']);
     $this->assertEquals("small", $requirement['value']);
-    $this->assertEquals(Requirement::SEVERITY_WARNING, $requirement['severity']);
+    $this->assertEquals(BaseRequirement::SEVERITY_OK, $requirement['severity']);
   }
 
 }