Function-based support (FBS) is an intervention strategy for decreasing problem behaviors and increasing replacement behaviors through the use of functional behavioral assessment and behavior support planning. Although FBS has been demonstrated to facilitate positive outcomes for children in a variety of educational settings, it has yet to be widely adopted because many schools have limited access to personnel (i.e., school psychologist, behavior specialist) with the expertise to implement it. This series of single-subject studies reports the ongoing development and validation of a method for training general educators to successfully and independently implement FBS for at-risk students in their classrooms. These studies highlight the experiences of one teacher who participated in three training phases and implemented FBS with three at-risk students. Results suggest that training was effective as indicated by knowledge gains regarding FBS principles and procedures, successful mastery and application of FBS practices, positive student outcomes, and favorable teacher and student perceptions of social validity. The implications and limitations of these results, as well as future directions for this line of research, are also discussed. (Contains 3 tables and 4 figures.)