Training and rating session The surgeons will attend a one day course. The course will consist of three parts: first a rating session to get baseline-ratings from participants of 6 video scenarios, then a teaching and training session and then another rating session with 4 new and 2 of the baseline-videos. During the first rating session the surgeons will only have the NOTSSdk rating form and will not be allowed to discuss with each other. The second rating session will be like the first but in addition to the rating form the participants will also be allowed to look in the full NOTSSdk behavioral marker system. The teaching will include an introduction to Human Factors and non-technical skills in surgery, and a short description of the development and intended use of NOTSSdk. The following training will allow participants to practice the rating of surgeons' non-technical skills on 4 video recorded scenarios and then discuss their ratings.