Use of a retention test in an investigation regarding the post-knowledge of results (KR) interval provides evidence suggesting that, while activity during the post-KR interval is detrimental to performance, no such assumption can be made about its effect on learning. Implications for motor learning and performance are discussed. (Author/PP)

Researchers studied the effect of interpolating extraneous information on students' ability to process cognitive information concerning their prior performances on the McCloy block test. The extraneous information was given in the interval between their last test and their next attempt to perform it. Results are discussed. (Author/PP)

In six articles on racquet sports, the origins of the games are traced, methods for teaching skills such as footwork, racquetball strategy, and badminton techniques are discussed, and the biomechanics of the one- and two-handed backhand in tennis are reviewed. Information about paddle tennis is included. (PP)

Research about the retention and transfer of motor skills is reviewed and applied to physical education and sport settings. More research that is theoretically and empirically based and from which practitioners can draw their technology is needed. (Authors/CJ)