Let me share with you a case framework that helped me to land a job at one of the top firms.
(1) FIRST - Initial Thought/Analysis
The objective is to create a statement of understanding and to let the interviewer knows that you are not easily fooled to take up his bait.
Ask for questions. Say something like: That is a very interesting question, however before I proceed there are few issues or clarification that I wish to seek from you".
- Understand the firm
- Rephrase the question
- Understand keywords in the question such as "same-store"
- Understand the objectives
Finally: say the case statement and ask whether the parameter of the same is correct
(2) SECOND - Core Analysis
Avoid Forceframework approach! - Never ever recite the framework's name such as Porter's 5 Forces, what you need is to simply use and apply them.
(i) Start with the industry top view/ big picture analysis and economics such as market trend, grwoth, size etc.
(ii) The framework, such as CBA, Value Chain. Porters etc etc. Practice alot. Remember that you can even apply CBA vs Value Chain. For example, Cost & Benefits of Combined Inventory Management etc etc.
Ask questions on the elements of your framework. Tactically ask whether you are on the right track.
Always explain how would you gather the information from. Practice quoting sources such as (secondary)internally generated reports, analyst reports, Trade Association journals etc etc.
(primary) interviews, Q&A
Do not forget the financials such as ROI, cost etc.
(3) THIRD - Strategy solution/recommendation
Make your recommendations.
(4) Further Analysis
Always remember to conclude with this part. There are probably other issues that the client need to consider such as current capabilities or revisiting its objectives.