There has been renewed debate in recent years about the relatively poor science discipline background knowledge of primary and preschool teachers, and their lack of confidence to teach science stemming from this. A reaction from teacher educators, such as recommended by theDiscipline Review of Teacher Education in Mathematics and Science Report, has been to provide more explicit science discipline units in pre-service teacher education courses. However, a few studies have cast some doubt on the notion that more science discipline studies (Skamp, 1989; Stepans & McCormack, 1985). This paper reports on pre-service students' perceptions of their cofidence to teach science before and after a science education unit adapted from the PECSTEP work (Kirkwood, Bearlin & Hardy, 1989), which included only a small amount of physical science, and took an explicit gender approach emphasising the students as learners.