Objective: Progressive autonomous task performance is the cornerstone of teaching residents in the operating room, where they are entrusted with autonomy when they meet their supervisors’ preferences. To optimize the teaching, supervisors need to be aware of how residents experience parts of the procedure. This study provides insight into how supervisors and residents perceive different tasks of a single surgical procedure. Design: In this qualitative survey study a cognitive task analysis (CTA) of supervisors and residents for the 47 tasks of an uncemented total hip arthroplasty was executed. Both groups rated the level of attention they would assign to each task and were asked to explain attention scores of 4 or 5. Setting: University Med...