The purpose of this article is to investigate how collaborative research can be used to develop early interventions in preschool. The research has been conducted together with preschool heads, special educators and social educators in a small municipality. The initiative was taken by municipal managers. After the development work had started, researchers were invited to a collaborative research process that lasted for about two years. Data was collected through process meetings, critical incidents, interviews, surveys and group discussions. The process is characterized by phases where different staff groups were involved. Preschool teachers both stressed their own skills and also emphasized the importance of continuous support and guidance from special and social educators. Managers emphasized their increased overall skills about early interventions. Collaborative research has helped to structure, quality assure and anchor focus on early interventions. It has been a tool for highlighting the issue from different perspectives, when staff and researchers work together. It has helped paying attention to important aspects, suggesting new directions when needed. In the research process, social and special educators have received valuable support in their new roles in the preschool environment. When the research process was completed, permanent support for early interventions was implemented.