This report was commissioned by IRISS (Institute for Research and Innovation in Social Services) in 2008. Its aim was to establish a wider context for practitioner research and to explore its impact on practice. It identifies two distinct forms of literature. First, there is literature that conceptualises, theorises, researches or evaluates practitioner research. Secondly, there is literature that is practitioner research. The review considers both forms and draws together a series of questions that emerge.