“…How school-centred innovation is working in practice has, however, seldom been studied (Hargreaves 1983, Lindblad 1984. It is the intention of the present work to do such a study within the following framework: the concepts of formulation and realization and the demand for communication when these domains are disconnected give a preliminary contextual structure for teachers' practical reasoningor rationales -in their work to change their teaching within a school-centred innovation initiated from above.…”