diff --git a/qtism/runtime/tests/AssessmentItemSession.php b/qtism/runtime/tests/AssessmentItemSession.php
index 37d2b4e34..1b284246c 100644
--- a/qtism/runtime/tests/AssessmentItemSession.php
+++ b/qtism/runtime/tests/AssessmentItemSession.php
@@ -234,6 +234,12 @@ class AssessmentItemSession extends State {
 	 * @var AbstractSessionManager
 	 */
 	private $sessionManager;
+    
+	/**
+	 * List of callback functions
+	 * @var array
+	 */
+	private $callbacks = array();
 	
 	/**
 	 * Create a new AssessmentItemSession object.
@@ -586,6 +592,7 @@ public function beginAttempt() {
 		
 		// Register a time reference that will be used later on to compute the duration built-in variable.
 		$this->timeReference = new DateTime('now', new DateTimeZone('UTC'));
+        $this->runCallback('beginAttempt');
 	}
 	
 	/**
@@ -741,6 +748,7 @@ public function endAttempt(State $responses = null, $responseProcessing = true,
 		// Wait for the next attempt.
 		
 		$this->attempting = false;
+        $this->runCallback('endAttempt');
 	}
 	
 	/**
@@ -760,6 +768,7 @@ public function suspend() {
 	         
 	        $this->updateDuration();
 	        $this->state = AssessmentItemSessionState::SUSPENDED;
+            $this->runCallback('suspend');
 	    }
 	}
 	
@@ -783,6 +792,7 @@ public function interact() {
 	        
 	        // Reset the time reference. If not, the time spent in SUSPENDED mode will be taken into account!
 	        $this->setTimeReference(new DateTime('now', new DateTimeZone('UTC')));
+            $this->runCallback('interact');
 	    }
 	}
 	
@@ -1114,6 +1124,49 @@ public function onDurationUpdate(array $callback) {
 	    $this->onDurationUpdate[] = $callback;
 	}
 	
+    /**
+     * Register callback function which will be invoked after method 
+     * specified in the <i>$eventName</i> parameter is called.
+     * Events available for callback registration: 
+     * <ul>
+     *   <li>beginAttempt</li>
+     *   <li>endAttempt</li>
+     *   <li>suspend</li>
+     *   <li>interact</li>
+     * </ul>
+     * 
+     * Note that first parameter passed to the callback function always will be instance of current class,
+     * and the remaining parameters will be taken from the <i>$params</i> array. 
+     * 
+     * @param string $eventName name of method of current class after which callback function will be invoked.
+     * @param array $callback The function or method to be called. 
+     * This parameter may be an array, with the name of the class, and the method, or a string, with a function name.
+     * @param array $params Parameters to be passed to the callback, as an indexed array. 
+     */
+    public function registerCallback($eventName, $callback, $params = array())
+    {
+        $this->callbacks[$eventName][] = array(
+            'callback' => $callback,
+            'params' => $params
+        );
+    }
+    
+    /**
+     * Call callback functions registered for method specified in <i>$eventName</i> parameter.
+     * $this variable will be passed to the callback function as first parameter.
+     * 
+     * @param string $eventName
+     */
+    protected function runCallback($eventName)
+    {
+        if (isset($this->callbacks[$eventName])) {
+            foreach($this->callbacks[$eventName] as $callback) {
+                array_unshift($callback['params'], $this);
+                call_user_func_array($callback['callback'], $callback['params']);
+            }
+        }
+    }
+    
 	public function __clone() {
 	    $newData = array();
 	    $oldData = $this->getDataPlaceHolder();
diff --git a/test/qtism/runtime/tests/AssessmentItemSessionTest.php b/test/qtism/runtime/tests/AssessmentItemSessionTest.php
index 158ca426a..6287fda59 100644
--- a/test/qtism/runtime/tests/AssessmentItemSessionTest.php
+++ b/test/qtism/runtime/tests/AssessmentItemSessionTest.php
@@ -346,4 +346,42 @@ public function testSimultaneousSubmissionOnlyOneAttempt() {
             $this->assertEquals(AssessmentItemSessionException::STATE_VIOLATION, $e->getCode());
         }
     }
+    
+    public function testRunCallback() {
+        $itemSession = self::instantiateBasicAssessmentItemSession();
+        $itemSession->beginItemSession();
+        
+        $itemSession->registerCallback('beginAttempt', function ($item, $itemSessionTest, $itemSession) {
+                $itemSessionTest->assertEquals($item, $itemSession);
+                $itemSessionTest->assertEquals($item->getState(), AssessmentItemSessionState::INTERACTING);
+            },
+            array($this, $itemSession)
+        );
+        
+        $itemSession->registerCallback('suspend', function ($item, $itemSessionTest, $itemSession) {
+                $itemSessionTest->assertEquals($item, $itemSession);
+                $itemSessionTest->assertEquals($item->getState(), AssessmentItemSessionState::SUSPENDED);
+            },
+            array($this, $itemSession)
+        );
+            
+        $itemSession->registerCallback('interact', function ($item, $itemSessionTest, $itemSession) {
+                $itemSessionTest->assertEquals($item, $itemSession);
+                $itemSessionTest->assertEquals($item->getState(), AssessmentItemSessionState::INTERACTING);
+            },
+            array($this, $itemSession)
+        );
+        
+        $itemSession->registerCallback('endAttempt', function ($item, $itemSessionTest, $itemSession) {
+                $itemSessionTest->assertEquals($item, $itemSession);
+                $itemSessionTest->assertEquals($item->getState(), AssessmentItemSessionState::CLOSED);
+            },
+            array($this, $itemSession)
+        );
+        
+        $itemSession->beginAttempt();
+        $itemSession->suspend();
+        $itemSession->interact();
+        $itemSession->endAttempt();
+    }
 }
\ No newline at end of file