“…Whether these differences are a reflection of skilful or effective teaching, or a reflection of teacher socialisation or institutional constraints, is a matter of interpretation and value judgment, but there is a growing amount of evidence to suggest a developmental pattern. Evidence that the learning of cognitive discriminations can facilitate changes in teaching behaviour (Wagner, 1972;Borg & Stone, 1974) and the development of cognitive interpretations of teaching (McLeod & Mclntyre, 1977), point towards research on teachers' classroom decision-making potentially serving the function of describing teaching activity at a cognitive level, thus making available the means by which teachers can analyse, compare and modify their own teaching. Consequently psychological approaches to research on teacher's classroom decision-making will no doubt be ultimately evaluated in terms of their effectiveness in helping teachers to teach Correspondence: Dr James Calderhead, Department of Educational Research, University of Lancaster, Bailrigg, Lancaster LA1 4YL, England.…”