Enabling children and young people to act as researchers is increasingly viewed as useful in supporting their increased "participation" within settings where they live, work or receive services. This paper reports upon a project conducted by two educational psychologists (EPs) with two primary school class groups, in which the children and their teachers were provided with direct teaching and guidance to develop and undertake their own school-based research projects. The work of each class group produced significant developments of educational provision across the whole school, showing that the EPs' work had directly enabled the children to "make a positive contribution". In addition, teachers and psychologists observed several social, cognitive and personal benefits to the children brought about by their engagement in the processes of questioning, data gathering, analysis, knowledge generation, and dissemination. The authors emphasise the potentially valuable contribution of EPs in promoting children and young people's understanding and application of research skills, and in working directly alongside teachers within the classroom. Furthermore, the project represents a successful example of EPs and teachers engaging in joint direct work with children. (Contains 1 table.)