3.2 Additional Observations
As mentioned earlier, in order to avoid any influence of our study on the normal usage pattern and the user interaction with the target system, we did not inform any of the OR crew about our study plans, within 13 months of observations. Since some of the surgical team members were frequently present during different surgical sessions, we decided to not use any formal usability evaluation approaches like questionnaires and interviews within that period. However, after finishing the last surgeries, we had series of discussion sessions with main members of the surgical teams, who were mostly exposed to the system and interacted with the device, in order to get further qualitative feedback on the usability of the system within their surgical procedure. In this section we highlight the main issues mentioned in regard to the usage of this MR-based system within the OR context.