Why is the framework important? (This is a general post, written using McKinsey terminology)The framework is not merely an an academic exercise. Instead, it is designed to mirror the project management component of consulting. As a consultant, there is no one who will come along and tell you what you need to be doing. Rather, prior to a study (that's McKinsey terminology for a project), one needs to plan out the work.
When doing the case framework, put yourself in the mindset of an engagement manager (McKinsey). It is prior to the study, and you need to figure out what are the major workstreams for your Associates and Analysts (McKinsey). With this in mind, it should become more clear why "MECE" is so important.
What is "MECE"?MECE stands for mutually exclusive and collectively exhaustive. Meaning, the framework includes everything, and there is no overlap between the branches. Going back to our example, this is important because you wouldn't want to leave anything out of your project planning and you wouldn't want two of your associates or analysts working on the same thing!
Let's look at an example:Imagine the case prompt involves whether or not to build invest in building a hotel in Shanghai. For a framework, our interviewee identifies the following first-level buckets: (don't worry about all the second level buckets for now. Also, you may not write these out as questions. I bolded the words that one may actually write, but wrote out the questions so that we can internalize the fact that these are actually questions that need to be answered)
What are the
financials of the deal?
Can we actually
execute?
How much will we
charge per room?
What is the
market like?
What is the
competition like?
Is there any relevant
regulation?
So there is an obvious MECE violation here. How much will we charge per room is already included in the financial bucket. However, there is another problem with this bucket - the associate or analyst working on it would probably complete their workstream alot faster than the rest of the team. In addition to MECE, it is important for the first-level buckets to be roughly comparable in terms of importance and potential depth. Remember, we are staffing our people on these buckets for the next ~8 weeks or so (McKinsey study's tend to run shorter than some other firms). We like to call this Meaty (think - is there enough meat for the associate to spend months chewing through?) and taken together, your first-level buckets should be MECE and Meaty.
There are some other possible issues with this framework as well. Regulation could fit beneath our ability to execute, and competition could fit beneath the market, but again, the point here is twofold: MECE and Meaty.
Feel free to follow up with any questions!