This document provides an overview of action research and organization development from the perspective of Peter Reason and Kate McArdle. It discusses their backgrounds and purposes in writing about this topic. The document then defines action research as a participatory, democratic process aimed at developing practical knowledge to address issues of importance to people and communities. It outlines several traditions and approaches within action research, including organizational change research, cooperative inquiry, and appreciative inquiry. It also discusses strategies of action research at the individual, small group, and organizational levels.