This study concerns the relation between teachers' beliefs towards teaching behaviour and their actual teaching behaviour in teacher portfolio assessment. We analysed the beliefs and behaviour of 18 teachers as described in their portfolios. In addition, each portfolio was independently assessed by two trained raters on eight content standards and the teachers' classroom behaviour was assessed by their own students in a questionnaire (n = 317). Linear multilevel analysis showed that part of the raters' assessments of the teachers' beliefs and their behaviour as described in their portfolios was significantly related to the students' assessments of their teachers' behaviour. Teachers with high raters' assessments on the content standard about "choosing and arguing for teaching strategies that meet students' knowledge, abilities and experience" had significantly higher student assessments than teachers who were judged low on this standard. Implications of the results and suggestions for further research are discussed. (Contains 3 figures and 1 table.)