TAS Associate applicants have rated the interview process at RSM with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 78.3% positive. This is according to Glassdoor user ratings.
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Not very difficult, there is a case and some technical questions involving excel. For the most part it is all behavioral. I agree with the degree of difficulty and weighting of importance of there questions asked.