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Many of the multimedia and convenience features in today's passenger vehicles involve Human Machine Interfaces (HMIs), such as the radio face plate or the remote key fob. The functional requirements for these systems are often written in terms of the customer interaction with the interface device. In the past, design engineers would not begin to test requirements for these systems until prototype hardware was available. However, many product development organizations are shifting from this hardware-based traditional development cycle, which relies on designing via a prototype and test iteration, to Model-Based Design. Unfortunately, testing systems with complex human machine interface requirements becomes less intuitive when the prototypes are removed from the design process, because the test cases must be scripted into the modeling environment instead of being applied directly to a prototype of the interface device.