The process was simple. 3 rounds with 2,2 and one interview. At each round, the seniority of interviewers is increasing. It is easy to plan an interview and the interviewers answer all questions. The cases were not too difficult in comparison with BCG for instance. Most of the cases are based on profit(cost-revenue) and growth(competitive environment). In the first round there are some figures, afterwards less and they more look at your insight and the way you crack the case. If they speak the same mother tongue as you they will do the interview in this language.