To a:I am not sure about your particular background but in my case, I had a PhD in Telecom engineering and my approach may not be the best example as I'm the kind of person who would really over-prepare (you'll see what I mean in a minute)Although it mentions in almost every posted site/forum related to Management Consulting that PhDs are not expected to know business terms, believe me you WILL BE!I prepared for the interview in parallel with my thesis writing (took my time over 4 months). I've spent the first two learning MBA material both at home and by attending classes unofficially at my uni (Economics, Marketing, Operations and Strategy).The next two months I invested heavily in practicing case interviews. And by heavily I mean I've read almost every book out there from the Columbia and Wharton guides to Case in Point and Ace your Case (list goes on, totaling around 13 individual books/guides).Once I was confident, I approached an ex-Mck "friend-of-a-friend" who was nice enough to offer me a mock interview. I would say this is the single MOST important aspect of my preparation, mostly because it acted like a nerve sponge.. I was a nerve wreck (didn't know the guy, but he was a very intimidating ex-Mck partner who really grilled me with the hardest interview I came across to date). This really got the nerves out of my system, so when I came to the real interviews I was much more confident. As a matter of fact, when I received my call after my first rounds, the interviewer pointed out that "I was very confident but not to the point of arrogance, which is a very difficult balance to strike"My cases varied from a Pharmaceutical company planning to launch a drug, and a retail tires store offering treading, to educational reform.The key here is not to focus on the particular cases but to identify what type of a scenario it is (Growth, Competitive Response, New Product/Market ..etc).One thing I noticed is that every single case at Mck had a significant mathematical part to it. You WILL BE asked to calculate numbers, so make sure you polish up your Arithmetic skills.Last, but most importantly, you have to have a solid structure to you approach. Resist the temptation to fire bullets in the dark and always start by laying your overall structure. If you do get stuck, don't panic, just recap on your logical tree and things should fall into place.If you REALLY hit a brick wall and get stuck completely, smile and make an honest remark like "Honestly, at this moment I can't think of other factors, except for X, Y & Z". It'll show your interviewer that you're confident under pressure, and he may be tempted to through in hints to guide you in the right direction (but don't expect a direct hint/answer).Good luck with your interview, and let me know how it goes