For the enrichment of practical knowledge. Good practice and useful theory for future primary teachers.

Key words: teacher education; Multimedia Interactive Learning Environment (MILE); theory and practice; theoretically enriched practical knowledge; realistic mathematics education (RME); Dutch key words: Pabo; Multimediale Interactieve leeromgeving (MILE); theorie en praktijk; met theorie verrijkte praktijkkennis; realistisch reken-wiskundeonderwijs. Abstract: The authors describe how a learning environment focused on representing various teaching practices to prospective teachers, known as the Multimedia Interactive Learning Environment (MILE) project, was inspired, designed, implemented, tested, and refined. Research on teacher education has begun to pay a lot more attention to the need to combine theory with practical reasoning. Good practice for use in teacher education courses gives student teachers the opportunity to exchange their theoretical frame of reference acquired in earlier courses and the (new) teaching practice observed in the study. Student teachers can organize practical knowledge narratively in a natural way, but this knowledge only contributes to professionalization if it is activated in appropriate situations along with connected theory. In that way student teachers can develop 'theoretically enriched practical knowledge'.