Our team has worked with 500+ candidates going into consulting interviews. From what we've seen, candidates tend to struggle most with very open-ended and ambiguous questions. For example:

How would you make Brighton the Las Vegas of Europe? (Brighton being a slightly faded seaside resort on the south coast of England).

A good way to handle this type of questions is to use a “from-to” approach:

1. To: What does it mean to be the Las Vegas of Europe?

- Hotel capacity

- Entertainment options (incl. Gambling)

- Attractiveness of the brand

- Transport links

2. From: Where is Brighton now?

- Hotel capacity

- Entertainment options

- Attractiveness of the brand

- Transport links

3. What is required to go from the current state to the target state

This from-to approach is used all the time by management consultants on projects and can be a lifesaver if you are faced with an ambiguous and open-ended case question.