Frustration has been primarily investigated in relation to aggressive behaviors, but may elicit other behaviors depending on the responses available to the individual. To test the effects of task frustration and task success on subsequent group behavior, college women (N=80) were randomly assigned to one of four conditions: task success, task frustration, task and personal frustration, and no task control. Subjects in the three experimental conditions completed individual performance tasks followed by a group task using Madsen's Cooperation Board. Subjects in the success condition were more cooperative in the group activity than subjects in the two frustration conditions. Results suggest that frustration can lead to increased competitiveness and decreased cooperation. Individuals under pressure to achieve in a competitive environment may become competitive in social interactions if they experience intellectual failures, even though such competition is non-rewarding. Success in intellectual tasks may promote social cooperation. (Author/JAC)