The aim of this study was to investigate multiprofessional collaboration as well as collaboration between professionals and challenging students and their parents in which the focus for these collaborations was on handling the challenging students' academic and social behavior. A grounded theory study of collaboration between a prereferral resource team and teachers, principals, challenging students, and their parents was conducted. Qualitative interview and focus group methods were used. The findings presented a grounded theory of collaborative synchronizing in relation to challenging students around two ideal types, human resource synchronizing and human resource desynchronizing. (Contains 1 figure.)