How unique shall your Issue Tree structure be for McKinsey Interview?

No matter what framework you want to use, make sure to adapt it to the actual question.

Even a framework derived from the Cs and the Ps can be relevant, but you need to make it clear that you are following a real hypothesis than simply going through the motion and checking the box. As Matt mentions, we hate having someone just going mechanically through a poorly designed framework "just because"

I personally hated seeing generic tree structures from interview candidates as almost anyone can learn them. The general rule is that the more senior the interviewer, the less impressed they are going to be with generic structures. This is an important consideration a) in the actual interviews and b) when considering feedback from colleagues, ex-consultants, peers and PrepLounge candidates / coaches. Be sure on point (b) to take into consideration their actual interview experience and level. The discussions about case structure are MUCH different in 1st round decision meetings than in final round decision meetings.

Hi,

The short answer it - it comes with practice. There is a number of ways how you can approach in a MECE way:

1. If your structure works mathematically (e.g. Total time spent on cleaning operation = # of people x Frequency x Hours per cleaning per person)
2. If your structure comes from a formula (e.g. output rate = total number of people being served / time to serve one person)
3. If you are using the common industry drivers (e.g. revenues = # of customers x av. check) (e.g Passengers on the plane = capacity x Load Factor) or theindustry revenue streams (Fuel revenues / non-fuel revenues for the gas station) or the functional drivers (e.g. for the problems in sales : Sales strategy / sales people and allocation / motivation / sales process)
4. If your issue tree is a real framework used by the consultants (e.g. the famous Bain Cap framework for PE due dills: Market / Competitors / Company / Feasibility of exit) (e.g. People / Process / Technology) (e.g. The famous McKinsey framework - People don't want to do smth / they can't do smth / smth prevents them from doing that)
5. If your structure is a well-known academically MECE framework (e.g. Product / Distribution / Price / Marketing (Also known as 4P))
6. Structures from casebooks (e.g. Cheng with Market - product - customers - company) - some of them are good, but not so often to be honest

There is no magic pill how you can learn to build the MECE issue trees. !!!! It comes with a lot of Practice and reflection and building proper industry and functional knowledge. !!!!

Best