I was referred by an employee, then maybe a month later contacted for an interview. The interview itself was fairly easy; two 30-min behavioral sections (standard behavioral questions), then one 30-min case interview. The interviews were not conducted by recruiters, so the conversation was fairly casual, and the follow-ups were not meant to be "gotcha" moments. The case study question was, however, strange to me. The position was within the public sector consulting side, and I have an MPA so a good amount of exposure to public sector case studies, but the question was obviously geared towards MBA type applicants.

First round - 1 case interview with a Senior Manager. Second round 2 case interviews + behavioral with partners and senior partners. Fairly straightforward process and streamlined once it gets going.