Background During clinical supervision, medical students are expected to gain experience through clinical work, with the support of their clinical supervisor. What each supervisor chooses to emphasize and considers important will have a decisive impact on students’ understanding of what is content necessary to master in order to gain clinical skills. Therefore, in this study, the focus of attention is on what supervisors choose to emphasise during clinical supervision of fourth year medical students during a surgical course.

Method An ethnographic approach was used, including a selective intermittent time mode, where observation and informal interviews were conducted. Twelve supervisors and nine medical students at a teaching hospital in Sweden participated. Field notes were made during observation; these were transcribed and analysed qualitatively.

Results The analysis resulted in six topic areas describing what was emphasized during supervision. The topic areas were: 1) Identifying, collecting and combining information, 2) Problem-solving and decision-making, 3) Handling treatment of disease, 4) Practical skills and illustration of technical equipment, 5) Communicating with patients, and 6) Handling organisational demands.

Conclusions The findings of this study show the existence of several areas that are focused on in supervision. In authentic clinical situations, these topic areas were intertwined and overlapped and often appeared simultaneously. The clinical situations were adjusted neither to the students’ clinical experience nor to the needs of the students. Consequently, the students may find it difficult to determine what to learn and what to achieve during supervision. They may also find it difficult to understand the situations in the same way as their supervisors, because students focus on handling situations with a more theoretical and declarative approach to a larger extent than do their supervisors. The students therefore need supervisor support to develop and integrate theoretical knowledge. One conclusion that can be made is that supervisor awareness of students’ understanding is of crucial significance for the effective supervision. Regarding the nature of the content chosen in supervised situations, research in other settings and specialities would be required to map and to determine a more general theory of what is focused during medical supervision