The paper reports on a research focusing on one of the possible ways of leading pre service primary student teachers to constructivist educational style effectively. The research base for the study is formed by student portfolios.
The goal of analysing these portfolios is to look for the turning points in a student's development and for impulses that brought about any changes in students' attitudes. Analyses of several portfolios showed that creation of a portfolio itself and the following work with it has a significant and positive impact on formation of pre-service teachers' pedagogical beliefs.