Development and use of DAM, a computer-implemented learning exercise designed to illustrate management of a large multiple-use reservoir system, is described. Five management roles are available to students using DAM: (1) a regional planning commissioner; (2) a fisheries manager; (3) a power company executive; (4) a recreation specialist; and (5) a city mayor. We found that allowing students to switch roles emphasized inherent management conflicts and increased total system appreciation. There is no “best” management scheme for DAM. In practice, students manage until they can agree on and defend a particular strategy. The specific goal of DAM is to provide students with an understanding of the principles and problems of managing a multiple-use resource. Response from students indicates this goal was achieved. DAM is currently played by students' keypunching decisions on computer cards and submitting these to the computer center. An improvement would be to place DAM on a permanent file for access by remote typewriter terminal.