This article argues for the value of using student ratings to measure quality of teaching. An international study to test the validity of the dynamic model of educational effectiveness was conducted. At classroom level, the model consists of eight factors relating to teacher behaviour: orientation, structuring, questioning, teaching modelling, application, management of time, teacher role in making classroom a learning environment and assessment. The analyses revealed that student ratings are reliable and valid for measuring the functioning of the teacher factors of the dynamic model.