Newly qualified teachers of mathematics and science are a precious resource and it important that they are provided with appropriate support and challenge during their first year in post. This study examines the developing thinking and practice of a group of such teachers in England and the influence of their mentors within the workplace context of the school. We argue that thinking and practice is restricted by the concern to "fit in", by the belief that behaviour management should be addressed before teaching can be developed and by a lack of attention to the development of pedagogical thinking. We conclude that there is a need to change the beliefs and practices of induction mentors and develop their skills in discussing pedagogical ideas. This is most likely to be achieved within a school-wide culture of continuing professional learning. (Contains 3 notes and 1 table.)