ABSTRACT The purposes of the study were to describe (a) how one grassroots youth soccer coach was influenced by a progressive coach education programme (CEP) and (b) the factors that supported or negated the CEP’s effectiveness. Occupational socialisation theory guided the study. Aaron was observed during the CEP and pre- and post-CEP while coaching practices and games. Data were collected with two systematic observation instruments and four qualitative techniques. Descriptive statistics were computed for each category of the systematic observation instruments. Analytic induction and constant comparison were used to reduce the qualitative data to themes. The CEP had little influence on Aaron’s beliefs and pedagogies. Aaron’s professional socialisation was not powerful enough to overcome his acculturation or his organisational socialisation. The study indicates the need for lengthy CEPs, follow-up support and suggests coach educators should deconstruct their charges’ acculturation and mediate any negative organisational socialisation to which coaches may be subjected.