De Taalontwikkelende Vakleerkracht

For the implementation of content-based language instruction a better understanding is required of content teachers' behaviour and thinking. This understanding could form the basis of a strategically designed package of professional development activities as well as for the design of pre-service curricula. The results of seven case studies showT how teachers develop their interaction practice and their thinking about student participation in interaction. The findings show a hypothetical pattern in this development. The article discusses the consequences of the results for the context and conditions of implementation and professional development projects and outlines perspectives for future research.