This model was developed in response to a requirement established by the Office of Civil Defence (OCD), Department of the army. Its purpose is to provide a gaming organization and methodology for exercising and evaluating civil defence systems within the context of realistic and creadible changes in international tensions and cries buildups. Since the Game Model is designed for a broad scope of OCD test requirements at the national level, it features built- in flexibility, the employment of aggregation techniques, broadly controlled free play, and reliance on the intuitive judgment of game participants.