This study examined a six-month implementation of the Responsibility Model in a New Zealand secondary school. Data were collected through interviews, observations and student self-assessments. The implementation was found to be successful in developing positive, supportive and well-behaved classes in physical education. The majority of students developed a greater understanding of personal and social responsibility and became more personally and socially responsible in class. For most students, however, this understanding was firmly associated with physical education and they generally showed little understanding of the potential for the transfer of learning to other contexts. (Contains 1 note and 4 tables.)