Simulation has greatly enhanced the training of individuals and crews through their systematic exposure to essential elements of the environments in which they must perform. Similar benefits will be available to aviation, infantry, armor, and command teams when simulation and instructional technologies are applied to the unique problems of team training. Training systems geared to the development and consolidation of specific elements of team skill will employ computerized models of many battlefield environments and of the essential characteristics of friendly and hostile forces that comprise them. The team trainers of the future will make extensive use of modern computer technology in controlling the interactions among the team members and their practice environment, but they will also permit a high degree of flexibility in team response. Teams will practice in standardized environments in developing skill in fundamental procedures, but they will also be able to practice in free play settings to encourage the development and evaluation of innovative techniques. Simulation technology holds great promise for the training of many kinds of teams. The value of its impact depends heavily, however, on the care with which requirements on each kind of team are defined and on the care with which these requirements are analyzed and expressed as requirements on the training system.