Dear A,
There is only 3 types of clarifying question which you can ask before structuring your case:
questions that clarify the objective of the case interview
Here the basic things you have to know about the case objective:
2. questions about information that strengthens your understanding of the company
In this chapter the main things you have to know are:
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Business model: How does the company make money? Do they sell directly to customers or do they sell through retailers or partners?
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Products and services: What products and services does the company sell? What benefits do these products and services provide?
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Geographic location: Does the company have one location or are they a national chain? Does the company operate in just one country or do they have an international presence?
3. question about definition of a term you are unfamiliar with
Most consulting interviews do not require you to have specialized knowledge or expertise in an industry. Therefore, if you come across a term that you are unfamiliar with, it is completely acceptable to ask the interviewer for the definition.
The other question you may ask later while navigating through tree structure.
Hope it helps,
Best,
André