In our study only seventeen teachers were involved and we
focused on the perceptions of teachers and not on their actual
teaching practices. In order to develop insight in how sustainable
CE teaching practices can be realized, further research is needed,
involving more teachers and a broader range of data collection
methods. Involving teachers in collaborative inquiry-based curriculum
development, like we did in this project (and cf. the systematic
inquiry Buzzelli and Johnston (2002) advocated), seems to
be a promising approach, but it is also expensive and timeconsuming.
Future research could investigate how this approach
can be up scaled to other schools and to teacher training.