This poster focuses on the trends in UML simulation toolkits where tools interpret models instead of relying on generated code. This is an important development since it requires minimal configuration, can be used earlier in thelifecycle and can evolve as the design matures. Poster was presented at 2011 IV&V Annual Workshop by Tom Gullion http://www.nasa.gov/centers/ivv/workshops/ivvworkshop_2011.html#.VDxMvRak-8Q