This article traces the development of Instant Messenger Cooperative Development (IMCD) and other variations of the Cooperative Development (CD) framework as presented in the literature to date.It describes Edge’s seminal work on CD(1992) and its origins in person-centered approaches to psychotherapy. It also explores the expansion of the frame-work as it is adapted to be used with groups and computer-mediated communication tools. Finally,it shows the various uses of CD and IMCD from reflective practice and professional teacher development perspectives to supporting the research process for post-graduate students,teachers,and researchers alike. Reference: Boon, A. 2011. Developing Instant Messenger Cooperative Development. Bulletin of Toyo Gakuen University 19: 109-120.