5 rounds in total. First with an agency recruiter, second with GLG staff which involves a mandatory second language assessment otherwise they wouldn't be interested in hiring you. I spoke to the team leader and a colleague who appreciated my past experiences and skills. Consequently, in the fourth round, you are required to perform a case study for them which takes 1:30h. You are being assured that there is no wrong or right answer but the goal is to establish your reasoning and thinking. After, completing the case study they decided not to move forward with my application because of the lack of quality that went into it. For the case study, you are allowed 1 hour to provide a list of experts containing names, positions, and company that can answer or advise to the following question - A client (laptop manufacturer) approaches GLG asking them for advice on the current trend in laptop sales. I executed by researching prominent experts in the industry with 17 names and 2 alternative companies who specialize in market research and included my reasoning for my choices. The interviewer also asks you to rank yourself from 1-10 on your performance. Even though they assure that there is no right or wrong answer they already have a certain way of doing things and your way of thinking or researching may not be acceptable. Hope this helps to anyone that is planning to interview or who are in the latter stages of their interview with this company. Good luck.