I attended a group case study interview for the AC position and for a place at the ISW event that OC&C organizes every year. There were 6 of us and we were given a written case of roughly 20 pages of some text but mostly slide of different performance data of a fashion label. We had to discuss the case for 20 minutes, select 5 - 6 most relevant slides and then do a 10 minute presentation to the panel of interviewers, who included a manager and 2 consultants. After the presentation there was a brief Q&A session. The case wasn't difficult and I felt we did well as a team. Because I did not pass to the next round, I called for feedback later and was told that despite my good communication skills and the initiative that I showed in leading the case, my idea generation skills did not shine through enough. I was too focused on the process, apparently.