The aims of this study were firstly to determine the players' perceptions of their respective coaches' coaching effectiveness and secondly, determine the difference between big and small schools of the players' perceptions of their respective coaches' coaching effectiveness. Four hundred and seventy six players from 22 schools were asked to fill in the adapted version of the CES (coaching efficacy scale) (Feltz, Chase, Moritz, & Sullivan, 1999). The CES consists of four subscales measuring motivation (seven items), game strategy (seven items), technique (six items) and character building (four items). Each item was rated in a 9-point Likert scale from 0 ("Not at all effective") to 9 ("Extremely effective"). According to the descriptive statistics, players perceive their respective coaches to perform average and below average on the four tested constructs. There are also no practical significant differences between the perceptions of big and small schools players on the effectiveness of their respective coaches. The results of the study might determine and clarify whether volunteer coaches in high schools are effective according to their athletes' perceptions and may also help schools to evaluate their coaches and implement programs to develop more effective coaches. (Contains 3 figures.)