Great project Sarah-
I know alot of this project is already in process/moving along. I echo some of the previous comments that the subjective norm in your case is more that in current practice, attendings may not feel the need to do post-op debrief (for the reasons you laid out in attitudes) currently. I get a sense that the reason why post-op debrief is not more widely adopted is that the incentive to do it is not high for the attendings. I think the resident incentive program is a good place to start. Wonder if you considered whether the post-op debrief could be a billable item or documentation of post-op debrief could be part of the op-note and thus required for reimbursement/billing-- this would affect attending behavior. (an analogy would be the time-out pre-op checklists that are required to be in the chart )