Abstract: Model Based Testing for Real: The Inhouse Card Case Study A. Pretschner and O. Slotosch and H. Lötzbeyer and E. Aiglstorfer and S. Kriebel We describe the modeling concepts of the CASE tool AutoFocus as well as our Constraint Logic Programming based approach to model-based test case generation along the lines of an inhouse smart card case study. Besides testing the model itself, we used the generated test cases to validate the respective property in the actual hardware.