This article draws on a Norwegian project--in one primary and one lower secondary school--that had the aim of creating a shared understanding of classroom management and that resulted in a handbook on classroom management at each of these schools. Teacher reflection and teacher sharing were vital in this project initiated from the outside yet relying on bottom-up strategies. Three topics are studied: procedures of the projects, teacher experiences with procedures and teachers' perceptions of learning opportunities in the project. Data was collected using interviews, questionnaire and log from the process. Results show that, although the main project work was carried out by the teachers, the role of the principal was vital during the whole process. Furthermore, the findings of the project suggest organized work needs to continue after the project has ended. (Contains 3 tables.)