We present three closely related projects concerned with supporting students’ mathe-matical problem solving. The projects build on the assumption that problem solving activities are beneficial to students’ learning but challenging for teachers to organise. Teachers must find ways to support students’ progress in problem solving without removing necessary challenges. The projects deal with this support in different ways, something we intend to use to illustrate the risk that mathematics education research becomes fragmented, making it more difficult for teachers to access and use research results in their professional development. We welcome participants to discuss how closely related research projects like ours can collaborate and complement each other to contribute to a knowledge base that is accessible and useful to teachers.