Objectives At the very start of medical residency training, entrustment of clinical tasks may be a major challenge, on which current scientific knowledge is scarce. This study therefore aimed to gain insight into the process of supervisors' decision making underlying the entrustment of clinical tasks at the start of one-on-one supervisor-trainee working relationships. Setting This study was performed in a general practice (GP) training department in the Netherlands. Participants For this study, we recruited supervisor-trainee pairs who were just about to start the first year of GP residency training. Of 10 eligible supervisor-trainee pairs, 4 participated. Design We used a qualitative, social-constructivist research approach. Data from natu...