Hi Alioop, for me this evaluation was done by a psychologist for an hour. He asked me why I wanted the procedure, and my lifestyle at the time (diet habits, activity, social support), and what I had done in the past to lose weight and how much I lost on each attempt. I was also asked what I was doing to make changes that will support the surgery, like alternative ways I was managing stress eating so I wouldn't rely of food to cope with stress post surgery. Mostly what these evaluations are for is to see if you are ready for such a major change and if you would be successful with it through lifestyle changes and social support. I hope that this helps.