There is limited information about specific research constructs developed by adults with intellectual disability in undertaking research despite increasing involvement in research "with" rather than "on" these individuals. Participatory research was used with three young adults with intellectual disability to collaboratively develop a training programme and investigate the skills used and developed when undertaking the research project. Three research domains--Knowledge, Conceptual understandings and Skills, were identified, within which 18 subsets were categorised. Development in all domains and subsets occurred for all young adults, with variations in gains across subsets and participants. These young adults attained research knowledge, understanding and skills that enabled them to become collaborative researchers within this project.