http://blogs.msdn.com/silverlightgames/archive/2009/07/02/creating-a-model-project-for-your-game-design.aspxWith some versions of VS 2010 you are able to create UML projects, if you are a student in a science, technology, engineering or math class you have access to the full version of Visual Studio 2010 Team System through MSDNAA, if you do not have access,en-USCommunityServer 2.1 SP1 (Build: 61025.2)