The objective of this NSF (IERI) research project into teacher education is to document the collaborative development and reflection on tools to support implementing a problem-based learning program. This project has both research and professional development objectives. The practical objectives include the design of research-based materials and formats for the transmission of knowledge to less experienced teachers. One of the research objectives we will report at IKIT (that we also reported at AERA 2004) is an analysis of teacher reflections on the use of these tools using an adaptation of Bereiters epistemological stages in teachers levels of approach to knowledge.