A simulation system has been developed to facilitate the analysis of vehicle dynamics control systems (e.g., ABS, 4WS, active suspension, etc.). This system can analyze the controllability of a vehicle model when combined with a controller. Its main features are: 1. The ability to simulate the various motions of a vehicle, utilizing a vehicle model that has been adjusted for the purpose. 2. All operations, from data preparation to final analysis, can be done easily and efficiently.