The relationship between goal orientation, self-efficacy, perceived ability, effort, commitment, exertion, feedback tolerance, and process/outcome measures were investigated in 4 studies. In Study 1. feedback (win, lose, win/lose) in a competitive task (accuracy of dart throws) was manipulated. Results showed dart accuracy performance correlated significantly with ego orientation when feedback was positive (win opponent), but not when negative (lose) or alterable (lose/win). Self-efficacy and perceived ability after task familiarity predicted performance in all feedback conditions. In Study 2. a computer-simulated running task was performed by participants under 3 feedback modes (win. lose, win/lose) nested within 2 conditions (self-standard and against an opponent). Results indicated that ego more than task orientation accounted for the performance variance in all experimental conditions. Self-efficacy and task-specific psychological states accounted for 63% to 68% of the performance variance. In Studies 3 and 4. exertion time in strength and endurance tasks were related to the type of activity in which participants were engaged and their commitment and exertion tolerance in the specific tasks. Goal orientation and self-efficacy accounted for much of the exertion-time variables' variance, but they were not significant predictors.