This study aimed to examine the effects of an intervention program on the coaching behaviors of a soccer coach. The experimental study employed a single-case design (AB design). The study was conducted for 19 weeks, excluding 6 weeks of interruption. The participant was a soccer coach who was in charge of teams of eighth graders or younger players. The target behaviors were participant's coaching behaviors during weekday training sessions, which included instruction and feedback used in Synchro-Coaching. We confirmed the social validity of the program through evaluation by coach development expert, measurement and evaluation of team performance, and interviews with the participant. Three out of four target behaviors improved as a result of a three-step intervention program that utilized knowledge from coaching behavior guidelines and behavioral coaching. Finally, we discussed the future issues and limitations of this study.
