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The effects of self-set goals and public posting on athletic performance of 5 collegiate football players was studied. All players were linebackers on a National Association of Intercollegiate Athletics Division II football team. The dependent variables were the per-centage of correct occasions when the linebacker (a) positioned himself to cover a specified area on the field during a pass or from the line of scrimmage during a run; (b) moved to the correct position in response to the positioning of the offense; and (c) tackled and stopped the progress of the ball carrier. A multiple baseline design across behaviors showed an immediate increase in the practice performance of the players and a corresponding increase in game performance following introduction of the independent variable. This study extends research using public posting in sport by demonstrating the effects of player-determined goals and public posting of goal attainment. DESCRIPTORS: public posting, goal setting, athletic performance, football Research in sports psychology has relied heavily on laboratory studies, the results of which have not always produced improved performances for athletes in competitive sit-uations (Locke & Latham, 1985; Weinberg, Burton, Yukelson, & Weigand, 2000). This has promoted calls for athletes ’ performances to be studied in competitive environments over the course of a complete season (Green-span & Feltz, 1989; Swain & Jones, 1995). Such calls have been accompanied by rec-ommendations for the use of single-subject designs as the method of choice in assessing the effects of interventions in sport settings because of the sensitivity of these designs in tracking individual variability (Bryan, 1987