Abstract
Boys' task involvement and ego orientation motivational goals in mathematics were measured prior, during and one year after the introduction of co-education to a single sex boys' school. All primary and secondary boys enrolled in Grades 3 to 10 in the single sex school were followed over the three-year period. Comparisons were made over time across grades and cohorts with analysis of variance and hierarchical linear modelling. While there were significant effects for boys' task involvement in the transition from single sex to coeducation, particularly at the primary school level, there were no significant changes in boys' ego orientation goals.