Processes That Mediate the Relationship Between a Group Goal and Group Member Performance

The impact of a group goal on the performance of anonymous and nonin- teracting group members performing an additive group task was tested. Pro- cesses believed to mediate the effect, the role of self-set individual goals, the impact of information about the group's previous performance on the task (group knowledge of results; GRPKR) on goal commitment, and the motiva- tional basis of the goal were also assessed. Seventeen groups of three to five people performed two trials of an idea generation task. In the GOAL/GRPKR condition, group members were assigned a group goal for Session 2 and received information about the group's performance for Session 1. In the goal without knowledge of results (GOAL/NOKR) condition, group mem- bers were assigned a group goal for Session 2 without GRPKR. In the NO- GOAL condition, group members worked without a goal and without GRPKR. In each condition, group members worked on the task without talk- ing to other group members and individual contributions to the group prod- uct were unknown to others. Self-reports of effort, changes in individual performance strategies from Rial 1 to Rial 2, self-set individual goals, goal commitment, and personal challenge were collected. Results showed that (a) group members working toward a performance goal outperformed those working without a goal, b) information about the group's previous perfor- mance on the task did not influence commitment to the goal or performance, (c) changes in individual performance strategies mediated the group goal ef- fect but self-reports of effort invested in the task did not, (d) g m ~ p members working toward a group goal felt more personal challenge than group mem- bers working without a goal, and (e) self-set individual goals can not account for the group goal effect. The implications of these results for models of group goals and group performance are discussed.