Cockpit Avionics Prototyping Envi - ronment (CAPE) is a computer program that simulates the functions of proposed upgraded avionics for a space shuttle. In CAPE, pre-existing space-shuttle-sim - ulation programs are merged with a commercial-off-the-shelf (COTS) display- development program, yielding a package of software that enables highfidelity simulation while making it possible to rapidly change avionic displays and the underlying model algorithms. The pre-existing simulation programs are Shuttle Engineering Simulation, Shuttle Engineering Simulation II, Inter active Control and Docking Simulation, and Shuttle Mission Sim - ulator playback.