To help a group of nine adolescent boys with behavioural needs improve their social-emotional skills, the researcher designed and conducted a longitudinal intervention at a public secondary school in British Columbia. In order to complete this task, the researcher drew on the various strengths of action research, lesson study and learning study. Together their distinct attributes acted as an organizational framework and were seen to provide an effective and robust approach to school-based research. The action research component of the study ensured that the intervention had a deep understanding of the problems facing male students with behavioural needs, that stakeholders' voices were considered in the research and that the personal role of the researcher was acknowledged. Learning study established positive masculinity as the intervention's primary object of learning; and it helped influence the content and approach of individual sessions. Finally, lesson study's fluid and collaborative approach to assessment allowed for ongoing guidance and a more comprehensive and nuanced understanding of the study's results. Although there are similarities between action research, learning and lesson studies, the research discussed in this article demonstrates the efficacy and benefit in allowing their distinctive strengths to be used in conjunction for a longitudinal intervention.