Objective:The purpose of this study was to measure the efficacy of a novel faculty and resident educational bundle focused on development of faculty-resident behaviors and entrustment in the operating room.Summary Background Data:As surgical training environments are orienting to entrustable professional activities (EPAs), successful transitions to this model will require significant faculty and resident development. Identifying an effective educational initiative which prepares faculty and residents for optimizing assessment, teaching, learning, and interacting in this model is critical.Methods:From September 2015 to June 2017, an experimental study was conducted in the Department of Surgery at the University of Michigan Health System (UMHS). Case observations took place across general, plastic, thoracic, and vascular surgical specialties. A total of 117 operating room observations were conducted during Phase I of the study and 108 operating room observations were conducted during Phase II following the educational intervention. Entrustment behaviors were rated for 56 faculty and 73 resident participants using OpTrust, a validated intraoperative entrustment instrument.Results:Multiple regression analysis showed a significant increase in faculty entrustment (Phase I = 2.32 vs Phase II = 2.56, P < 0.027) and resident entrustability (Phase I = 2.16 vs Phase II = 2.40, P < 0.029) scores following exposure to the educational intervention.Conclusions:Our study shows improved intraoperative entrustment following implementation of faculty and resident development, indicating the efficacy of this innovative educational bundle. This represents a crucial component in the implementation of a competency-based assessment framework like EPAs.