Was contacted very shortly after submitting my application. First round interview was pretty straightforward behavioral interview, asked about past experience. Next round would have been case interview had I advanced.
I applied through college or university. The process took 5 days. I interviewed at Liberty Mutual Insurance (Boston, MA) in Feb 2015
Interview
In the first-round for the summer internship, there's an HR screening. The interview is more behavioral, with some questions to test your business acumen. In the second-round, you get a case and group interview with some behavioral questions
After your summer internship, if you performed well: you interview with an Executive, BU Head or CEO to get into the full-time program
Interview questions [1]
Question 1
First round: 5-8 behavioral questions. They just want to understand your past experiences and personality, strengths, how you work on teams, leadership roles you've played, and so on
Second round: It's a case study, but not like one given by McKinsey or Bain. With this interview, you're given all the data up-front. It's a 10-15 page case. Your job is to figure out the main problem and how to resolve it. They put you in a room on your own where you'll have 15-30 min. to read and prepare it.