The process consisted of three rounds:
One general, one case and one HR interview
First round was about the CV and included a presentation about two topics on their website (which you have to prepare at home).
Second round was two small cases:
1) Estimate the percentage of the Belgian GDP spend on benzine annually.
2) The UN asks you to bring together 20000 participants for a millennium goal event. How would you organize it.
You get a laptop and about 30 min to prepare.