The article examines the processes and challenges involved in conducting participatory research and evaluation in schools, by looking at a case study of a collaborative evaluation research that was conducted in a secondary school in Israel by two researchers and three teachers. It describes the experiences of the research team while conducting the study, the processes that developed during this collaboration, and the kinds of knowledge that emerged over the two years of teamwork. It also describes the features of the relationships between the various individuals who participated in the study. Implications for evaluation in schools are presented.