The lion's share of interviewing is done with students, undergraduates for Associate positions and MBAs for consulting positions. There is an extensive resume screen and only the top candidates from the top schools are chosen for interviews. Interviews are done for "classes" of consultants that will all start at the same time and position. Candidates come in for several case interviews in one day - typically 3-5 interviews. Those who make it through the first round are invited back for a second round. Successful candidates receive an offer that is non negotiable.