The aim of this research was to study the impact of cooperative learning on changes in cooperative behaviours and acceptance amongst pupils with learning disabilities related to risk-taking. One hundred and sixty-eight French first year middle school pupils participated in this study. Thirty-six pupils with learning disabilities were mainstreamed in six ordinary classes during seven two-hour gymnastic lessons. Three classes practised under low risk conditions and three classes performed under high risk conditions. The helping behaviours of the SEGPA pupils were observed and the acceptance of pupils was measured thanks to a sociometric questionnaire during the first and last lessons. The results showed that risk-taking affected the helping behaviours and the acceptance of pupils with learning disabilities. These results lead us to think about the factors that could have an impact on the influence of cooperative learning structures when mainstreaming pupils with learning disabilities in physical education. (Contains 3 figures and 2 tables.)