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This article reports on an ongoing longitudinal investigation of the influence of professional development on teaching strategies. The study has so far identified models of type and duration of professional development activity for a national sample of primary subject co-ordinators and secondary heads of department of English, mathematics and science. This article reports on participants' changes in type of professional development activity over time, extent of subject content emphasis of the development activity and subsequent changes to teaching practice effected by involvement in a longer term professional development activity.
Boyle et al. (Sun,) studied this question.