“…Collaborative teacher learning In this study, collaborative teacher learning is defined as undertaking (a series of) learning activities by teachers in collaboration with colleagues, resulting in a change 548 J.J. Doppenberg et al in cognition and/or behaviour at the individual and/or group level (Meirink et al, 2007;Putnam & Borko, 2000;Shuell, 1996). In this study, it is assumed that the learning activities undertaken may be conscious or unconscious, and that these are performed in a social context.…”