After passing a phone screen, I participated in an initial "case interview" which was just basic statistics using expectation functions (think econ 100 micro stuff, basic cost benefit). Then, I did a more rigorous case study using a sample situation without data or numbers that was mostly about how you thought through the problem. My example involved transit and involved thinking about how to diagnose a delay issue given some available data and information about the system. Finally, I moved on to two regular interviews with people I would be reporting to or working alongside, along with one final case interview with the department director that dealt more with data that I might have used in the role. There was also one other interview with a product manager. I found that one the most difficult, as I had to answer conceptual questions as opposed to just mathematical ones. The recruiter works with you throughout the whole process and is very helpful. I actually had to reschedule something at the last minute due to a sudden situation, and the recruiter was able to quickly help me reschedule my interview. Overall, it was a long process, but reasonable. Took probably 3 weeks from beginning to end, as I was contacted the day after I submitted my application. Only one interview, the one with the Product Manager, I found particularly difficult, as I think the "case interview" questions were fairly straightforward and involved simple math. With enough practice, one should be good with these (it's not like a consulting case interview, for example).

Phone screening followed by case interviews with members of the team. I found it difficult to participate in case interviews over the phone as you’re expected to jot down numerous details on the fly with pen & paper.