Issue Trees

Issue Trees (also called logic trees) are a structured approach to problem-solving used extensively in management consulting. They break a complex problem into smaller, more manageable sub-problems in a MECE (Mutually Exclusive, Collectively Exhaustive) way.

1. Start with the core question — Place your main problem or question at the root of the tree.
2. Break it down — Split the problem into 2-5 sub-issues that are:

• Mutually Exclusive — No overlap between branches
• Collectively Exhaustive — All possible aspects are covered

1. Continue breaking down — For each sub-issue, repeat the process. Keep going until you reach actionable, testable hypotheses.
2. Prioritize — Not all branches are equally important. Identify which branches are most likely to contain the answer.
3. Analyze — Work through priority branches with data and analysis.
4. Synthesize — Combine insights from different branches into a coherent answer.

• Revenue = Volume × Price
• Volume declining?
• Fewer new customers?
• More customers churning?
• Existing customers buying less?
• Price declining?
• Discounting more?
• Mix shift to lower-priced products?
• Competitive pricing pressure?

Issue Trees help you break complex problems into manageable pieces while ensuring you don't miss anything important. The MECE structure prevents both gaps and redundancy in your analysis.