This paper describes the International Futures (IFs) computer assisted simulation game for use with undergraduates. Written in Standard Fortran IV, the model currently runs on mainframe or mini computers, but has not been adapted for micros. It has been successfully installed on Harris, Burroughs, Telefunken, CDC, Univac, IBM, and Prime machines. It requires about 54K core. The global model of IFs represents the world in ten nations or regional groupings: The United States, Western Europe, the rest of the Western Developed World, Eastern Europe, the Soviet Union, Latin America (except OPEC), Africa (except South Africa and OPEC) plus the Non-OPEC Middle East, OPEC, South and Southeast Asia, and China. The issues of IFs are the rapid acceleration of global population growth, the uncertainty of food sufficiency, the degradation of environmental quality, the shortages or crises of resource (especially energy) availability, and the persistent gap between the global rich and poor. The base year of IFs is 1975. It is normally used through 2000 or 2025, although it can theoretically run indefinitely. The model, which has over 2,000 variables, has four major submodels: population, economics, agriculture, and energy. Each submodel separately represents each region. Interested readers are invited to request user manuals or equation descriptions from the author. (Author/RM)