This report presents the results of a six month effort by Abt Associates Inc. to develop a game to simulate some of the major aspects of the terror phase of internal revolutionary conflict in an urban environment and to explore the feasibility of developing a computer model of urban insurgency based on game findings. Research on twenty selected cases of urban insurgency preceded development of the game, known as the ARPA URB-COIN GAME, which has been played eight times to date; five times in developmental test versions, and three times in its current operational form.