This article describes how some Swedish compulsory schools work to achieve collective development of practices in mathematics and science. The overall aim is to increase knowledge about factors influencing progression to professional learning in different school contexts. Data were collected through four case studies by interviews with teacher teams and principals and were analysed in a meta-perspective by using the components of the Collaborative Action Research model. The findings showed that the schools had reached different phases concerning progression to professional learning. Changes aiming to improve teaching and learning are context-bound. Therefore the authors suggest some crucial questions to support professional learning in the prevailing school culture.