“…Different possibilities have been described in the literature: VR simulator recorded data, checklists, and global scores, assessment using electromagnetic tracking devices or video tracking devices. 7,8,12,13,15,21,22 We used GRS and 2 independent observers to evaluate the operative performances, similar to other studies in the literature. 7,8,23 The low interobserver variability is proof of the subjective evaluation using GRS scores, and we consequently looked for a similar pattern of changes in each category and for each observer.…”