diff --git a/src/Symfony/Components/EventDispatcher/Event.php b/src/Symfony/Components/EventDispatcher/Event.php
index 5b81d4cb67..21c79d1fd5 100644
--- a/src/Symfony/Components/EventDispatcher/Event.php
+++ b/src/Symfony/Components/EventDispatcher/Event.php
@@ -109,6 +109,46 @@ class Event implements \ArrayAccess
     return $this->parameters;
   }
 
+  /**
+   * Returns true if the parameter exists.
+   *
+   * @param  string  $name  The parameter name
+   *
+   * @return Boolean true if the parameter exists, false otherwise
+   */
+  public function hasParameter($name)
+  {
+    return array_key_exists($name, $this->parameters);
+  }
+
+  /**
+   * Returns a parameter value.
+   *
+   * @param  string  $name  The parameter name
+   *
+   * @return mixed  The parameter value
+   */
+  public function getParameter($name)
+  {
+    if (!array_key_exists($name, $this->parameters))
+    {
+      throw new \InvalidArgumentException(sprintf('The event "%s" has no "%s" parameter.', $this->name, $name));
+    }
+
+    return $this->parameters[$name];
+  }
+
+  /**
+   * Sets a parameter.
+   *
+   * @param string  $name   The parameter name
+   * @param mixed   $value  The parameter value
+   */
+  public function setParameter($name, $value)
+  {
+    $this->parameters[$name] = $value;
+  }
+
   /**
    * Returns true if the parameter exists (implements the ArrayAccess interface).
    *
diff --git a/tests/unit/Symfony/Components/EventDispatcher/EventTest.php b/tests/unit/Symfony/Components/EventDispatcher/EventTest.php
index 024801b429..0d4961437c 100644
--- a/tests/unit/Symfony/Components/EventDispatcher/EventTest.php
+++ b/tests/unit/Symfony/Components/EventDispatcher/EventTest.php
@@ -12,7 +12,7 @@ require_once __DIR__.'/../../../bootstrap.php';
 
 use Symfony\Components\EventDispatcher\Event;
 
-$t = new LimeTest(11);
+$t = new LimeTest(16);
 
 $subject = new stdClass();
 $parameters = array('foo' => 'bar');
@@ -26,9 +26,26 @@ $t->is($event->getSubject(), $subject, '->getSubject() returns the event subject
 $t->diag('->getName()');
 $t->is($event->getName(), 'name', '->getName() returns the event name');
 
-// ->getParameters()
+// ->getParameters() ->setParameter() ->hasParameter() ->getParameter()
 $t->diag('->getParameters()');
 $t->is($event->getParameters(), $parameters, '->getParameters() returns the event parameters');
+$t->is($event->getParameter('foo'), 'bar', '->getParameter() returns the value of a parameter');
+$event->setParameter('foo', 'foo');
+$t->is($event->getParameter('foo'), 'foo', '->setParameter() changes the value of a parameter');
+$t->ok($event->hasParameter('foo'), '->hasParameter() returns true if the parameter is defined');
+unset($event['foo']);
+$t->ok(!$event->hasParameter('foo'), '->hasParameter() returns false if the parameter is not defined');
+
+try
+{
+  $event->getParameter('foobar');
+  $t->fail('->getParameter() throws an \InvalidArgumentException exception when the parameter does not exist');
+}
+catch (\InvalidArgumentException $e)
+{
+  $t->pass('->getParameter() throws an \InvalidArgumentException exception when the parameter does not exist');
+}
+$event = new Event($subject, 'name', $parameters);
 
 // ->getReturnValue() ->setReturnValue()
 $t->diag('->getReturnValue() ->setReturnValue()');