This paper is about the relationship between research, policy and practice in education. It outlines reasons for the increased interest in research and its impact and describe some of the difficulties in studying this relationship. A conceptualization of the knowledge mobilization process is presented that identifies three overlapping and interacting domains--the production of research, the end use of research, and the intermediary processes that link these two. The paper reviews current research and develops ideas about all three of these aspects, identifying areas of understanding and gaps in current knowledge. A video abstract of this article can be viewed at https://vimeo.com/56377921