Do not use a profitability framework when profit is not the core decision the client is trying to make.

Frameworks are tools, not default scripts. Market entry, capacity, pricing, growth, organizational, nonprofit, and operational questions often need different drivers.

Even in a profit case, the standard tree may be only the starting diagnosis. Once the key driver is identified, the structure should become more specific to the business.

Before choosing any framework, restate the decision and ask what must be true for the client to succeed. case interview guide.

I used to force rev/cost into everything. The biggest improvement was asking what decision the client actually needs to make first.