Is an "other" bucket OK?

It can keep you exhaustive, but a large "other" signals a weak split.

Report outlines, problem solving, market segmentation, and consulting case interviews.

MECE

💼 Business By CampusDown Wiki Editorial Team Last updated October 26, 2026

MECE—mutually exclusive, collectively exhaustive—is a principle for breaking a problem into parts that don't overlap and together cover everything.

Contents

1. What are MECE's two conditions?
2. How do you build a MECE logic tree?
3. FAQ
4. References

What are MECE's two conditions?

Mutually exclusive: no item overlaps another. Collectively exhaustive: together, the items leave nothing out. Splitting customers into "under 20, 20–29, 30 and over" is MECE; "students, people in their 20s, employees" overlaps (20-something students) and misses people (an unemployed 45-year-old). It underpins the Pyramid Principle that Barbara Minto developed at McKinsey.

How do you build a MECE logic tree?

For "revenue is down," split revenue = customers × average spend; split customers into new + returning, and spend into price × quantity. Formulas, processes (visit → buy → repeat), opposites (internal/external), and frameworks like SWOT or the 3Cs make MECE splits easier. In practice, not missing a key driver matters more than perfect purity.

FAQ

Is an "other" bucket OK?: It can keep you exhaustive, but a large "other" signals a weak split.
Where is MECE used?: Report outlines, problem solving, market segmentation, and consulting case interviews.

Sources reviewed: 2026-10-25

References

Minto, B. (1987). The Pyramid Principle: Logic in Writing and Thinking. Minto International.
Rasiel, E. M. (1999). The McKinsey Way. McGraw-Hill.

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This article was last updated on October 26, 2026. It is based on widely recognized original works and textbooks; when citing it in a paper, please check the original sources listed in the references.