Index: /trunk/autoquest-core-tasktrees/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/UserSession.java
===================================================================
--- /trunk/autoquest-core-tasktrees/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/UserSession.java	(revision 1406)
+++ /trunk/autoquest-core-tasktrees/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/UserSession.java	(revision 1407)
@@ -15,4 +15,5 @@
 package de.ugoe.cs.autoquest.tasktrees.treeimpl;
 
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Iterator;
@@ -45,5 +46,5 @@
      * </p>
      */
-    private List<ITaskInstance> executedTasks = new LinkedList<ITaskInstance>();
+    private List<ITaskInstance> executedTasks = new ArrayList<ITaskInstance>();
 
     /* (non-Javadoc)