This case interview preparation video shows you how to open and analyze a case. Most candidates assume analyzing a case is the most important part of doing well on case interviews. While this is certainly important, in practice it is often impossible to analyze a case well if you don't open or structure the case well up front.
The setup to the case is vital. As a case interviewing during a mckinsey interview, I could often determine within 5 minutes if the candidate was going to fail a particular case. Sometimes it would only take 3 minutes. Why? It's the opening of the case. While it's possible to open a case in several different (and correct ways), there are some definitely wrong ways to do so. This video shows you what to avoid as well as what to focus on when open and then analyzing a case.