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Abstract
Gentile (1972) holds that knowledge of performance (KP) is the most effective form of information for the acquisition of a closed skill. To test this prediction, one group of subjects was given both KP and knowledge of results (KR) and the other group was given KR and verbal encouragement following each basketball shooting trial with the nondominant hand. The results showed a significant improvement in the performance of both groups in the skill acquisition phase, but a significantly higher level of performance by the KP + KR group following verbal feedback withdrawal. It was concluded that KP is a strong feedback source in the acquisition of a closed motor skill.