The design of a series of planning games is outlined. The purpose of the games is to convey an appreciation of the variety of possible futures and to indicate both how the occurrence of some events may affect the probability of occurrence of others and how much of a role chance may play, as opposed to deliberate intervention by the players, in affecting the future course of events. The structure of the games permits their application to the simulation of planning in many fields. The games are for zero persons (that is, no player interventions are possible), or for one or two players. The basis for all the games is forecasts, which are usually obtained from intuitive estimates by experts. Essential preliminary steps involved in constructing a game of one of the types discussed here are outlined. (JK)