A sports psychologist is hired by a college to help its basketball team get back on a winning track. The psychologist meets with the coach to plan a series of treatments designed to improve the players' performance and the team's morale. One of the behaviors selected for improvement is frequency of taking "good shots." Specifically, the coach thinks that a major problem with her team is the tendency of the players to take low percentage shots rather than show patience in waiting for a higher percentage shot opportunity. The psychologist decides to work with the three starting players with the lowest overall field goal percentages: Beth, Carol, and Arlene. The dependent variable is the proportion of high percentage shots taken during practice scrimmages during a 3-week period prior to the beginning of the season. The psychologist decides that the reinforcer for behavior change will be a visual record of a player's performance posted on the door of a player's locker after each practice session. The psychologist uses a multiple-baseline across subjects design to assess the effectiveness of this motivational technique. Results are shown below: