This article discusses the "lessons learned" from an attempt to establish an interdisciplinary education research group. The growth, development and dissolution of the group are treated as an instrumental case study. Current literature on interdisciplinary collaboration is synthesized in order to provide a frame for analysis. Data was collected over several years and included three rounds of written participant reflections and documentation of group activities and meetings. Five major themes arose from the research, covering issues such as disciplinary diversity, common ground, interpersonal relationships, career pressures, and the need for concrete problems and tangible progress. Based on these themes, a number of "lessons learned" are discussed which will likely be of great interest to those considering similar interdisciplinary initiatives.