This research was undertaken to investigate teachers' and principals' perceptions of the roles of principals in curriculum development in primary schools in central Jamaica. The sample consisted of thirty eight principals and three hundred and thirty-two teachers from thirty-nine primary schools. Data pertaining to teachers' and principals' perceptions were obtained through the Teachers' Evaluation of Principals Questionnaire and the Principals' Self Evaluation Questionnaire. Specific attention was given to two aspects of the principals' behaviour, namely lesson planning and other curricular issues. The main findings showed that while principals felt that they were helping teachers with lesson planning, the teachers did not share that view.