I faced a problem while creating parallel tasks in state machine workflow. My requirement is same as OUT of Box SharePoint approval workflow which allows multiple users to approve the document and when everyone approves the document, document moves to next state which is approved. All the articles pointed me that this is possible in sequential workflow. Here is the thread which explains the problem, I would no be investing much time to explain the problem http://groups.google.com/group/microsoft.public.sharepoint.portalserver.development/browse_thread/thread/e0beac08110f6135 I downloaded the code sample available at Microsoft site which is basic state machine workflow. Following is the link. http://code.msdn.microsoft.com/SharePoint-2010-Creating-39ac75ea Modifications to the code are as follows: Add a new state at level 2. In the state initialization, create two tasks with different Correlation token, task ids and task properties. Now add two event