The process took 1 day. I interviewed at McKinsey & Company (Jersey City, NJ) in Aug 2009
Interview
The skills test was one hour long with 26 questions pertaining to three different cases. There were about 30 of us taking it at the same time, with three different test versions. I would say that the practice tests are fairly representative of what I saw on the real test. A fairly even mix of quantitative and qualitative reasoning questions. My strategy for the test was to only read the questions, and then mine for relevant info in the background after I knew what I was looking for. This seemed to work pretty well. I finished my first pass of the test in 30 minutes, leaving several blank (if the question looked too hard I automatically skipped it), and then returned to the difficult ones with the remaining 30 minutes. We don't get a score on the test, so there's no way to really know how well this strategy worked, but it seemed well-suited to me.
I interviewed at McKinsey & Company (Ciudad de Mexico)
Interview
Interview process was really great, all interviewers were friendly and professional. Started with a phone screen, then two case interview rounds with a partner and a senior associate, followed by a final round covering fit and problem-solving skills
Interview questions [1]
Question 1
Tell me about a time you had to influence someone without formal authority
It was a one-to-one interview with a consultant. It's a typical case study. The experience was traumatizing. I know my answers weren't great, the consultant was elegant and didn't bother to hide his boredom.
Interview questions [1]
Question 1
What was the most difficult situation you have encountered in the workplace? What did you do about it?
Had 2 rounds. First was a virtual interview with 2 sessions back-to-back. One case and one PEI in each. Second was a final in person round, with 3 sessions back-to-back with one case and one PEI each.
Interview questions [1]
Question 1
Tell me about yourself
Behavioral questions - There are only 4 PEIs which are listed in their career prep site