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Not Available The traditional approach for guidance and control studies in aerospace applications typically involve the synthesis of a vehicle model, which would be used as a design model for the guidance and control design and/or as the truth model for evaluating the guidance and control laws. Although efforts are generally made to reuse previously proven models, the efforts normally would involve custom modifications, and often the modifications would reduce the performance of the computer code and consequently its usability. It is therefore desirable to have a computer program that can support development of new vehicle models with a flexible database of often-used subsystems. Proposed herein is a Common Environment for Guidance and Control Studies (CEGACS). The envisioned product is a computer program that will include subsystem functions for synthesizing most aerospace vehicles of interest to the Air Force, including launch vehicles, orbiting satellites, reentry vehicles, and aircraft. The overall concepts include the ability to evaluate the system within the environment, and the ability to extract the system model for use on other platforms or by other computer programs. The CEGACS product is also envisioned to support evaluation and control over a computer network.