Abstract
The purpose of this study was to describe and analyze systematically the coaching behaviors of more and less successful high school boys’ tennis coaches during practice sessions. The Arizona State University Observation Instrument, consisting of 14 behavior categories, was used to compile data on nine coaches (five judged as more successful and four judged less successful, based on win records). Time sampled event recording was used to collect the data, with each coach being observed during preseason/early season, midseason, and late season for a total of three observations per coach. Analysis of the data showed that the more successful coaches asked a significantly greater number of questions of their players than did the less successful coaches. The tennis coaches demonstrated more instructional behaviors than any other behavior but spent more intervals in the Other category than in any other behavioral category. Other, Management, and Silence accounted for almost 75% of all intervals.

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