The Minto Pyramid
The Minto pyramid is a rule for ordering a document: state your answer first, then the reasons that support it, then the evidence under each reason [1]. You think bottom-up, from data to finding; you present top-down, from finding to data.
Barbara Minto developed it at McKinsey in the 1960s while teaching consultants to write. Her diagnosis was that unclear writing is rarely a problem of sentences or vocabulary but of order: most prose follows the sequence the thinking happened in, which is the one sequence a reader cannot use.
The shape
Every document supports one governing claim; beneath it sit the reasons, and beneath each reason, the evidence. Minto gives three rules:
- Ideas at any level must be summaries of the ideas grouped below them.
- Ideas in a grouping must be the same kind of idea.
- Ideas in a grouping must be logically ordered — deductively, chronologically, structurally, or by importance.
Any claim that tells the reader something new raises a why? or how?, which the level below must answer — so the discipline is to “refrain from raising any questions in the reader’s mind before you are ready to answer them” [1].
Grouping: the plural-noun test
A grouping holds only if you can name it. Minto’s check is that “you can clearly label the ideas with a plural noun” [1] — reasons, problems, steps, options. If the only word covering your list is points or things, the grouping is wrong, and the fix is in the analysis rather than the wording. This is the requirement usually called MECE, in a form you can apply in seconds.
Three is a convention, not a rule. Minto grounds the count in short-term memory: the mind holds about seven items, and “a convenient number is three, but of course the easiest number is one.” Two reasons that genuinely cover the question beat three where one is a detail in disguise.
Deductive and inductive groupings
Reasons are joined one of two ways, never both at once. A deductive grouping is a chain — this is true, that follows, therefore. An inductive grouping is a set of independent points sharing one characteristic, from which you draw an inference.
Deduction is how problems get solved; induction is how findings should be presented. A deductive document makes the reader re-enact the analysis before learning anything, and it fails at its weakest link — knock out one reason of three in an inductive grouping and two still stand.
The introduction: SCQA
The answer should not arrive cold. Minto’s introduction puts the reader on ground they already accept, so the conclusion lands as the answer to a question they now hold:
The Question is usually never written down — a Complication that does its job raises it unaided, and if you must spell it out, the Complication was too weak. Keep the Situation short; a bloated Situation is the commonest failure, because it is the safest part to write.
In practice
For example, a proposal to replace a logging library arrives bottom-up: a terabyte a day, three services failing in a cascade at peak load, sixteen engineer-hours a week lost to firefighting, a rewrite estimated at two engineer-months, and — in the last line — a recommendation to rewrite it. In pyramid order it opens “rewrite the logging library this quarter: two engineer-months, breaking even in five”, then the three reasons with their measurements beneath. Nothing is added and nothing cut; only the order changes, and the hedge disappears because the evidence never supported it.
The same holds for a heading: “Logging library analysis” asserts nothing, while “the logging library costs sixteen engineer-hours a week” is a claim a reader can act on or dispute. A useful check is to read only your titles, in order — an argument, or a table of contents?
Limitations
The pyramid is for documents asking a reader to accept a judgment or make a decision. It is the wrong shape where chronology is the content — incident write-ups, runbooks, procedures, project timelines — because time order is already the logical order. It is also wrong for exploratory work: it demands a conclusion, and forcing one you have not reached yields a confident document built on nothing.
Where the audience will reject the conclusion before hearing why, lead with the shared problem and let the answer land a beat later — still in the first paragraph. And structure is no guarantee of correctness: a well-built pyramid over bad evidence only makes a wrong conclusion easier to find.
How solid is this?
This is a practitioner framework, not an empirical finding. It rests on Minto’s experience teaching writing at McKinsey from 1966 and argues from worked examples rather than studies. There is no controlled evidence that pyramid-ordered documents produce better decisions.
Its one external support is George Miller’s “The Magical Number Seven, Plus or Minus Two”. Miller’s limit is real but concerns short-term recall of unrelated items — a weaker claim than “a reader can follow only three reasons.” That inference is Minto’s, not Miller’s.
Note also that the revised 2009 edition has no chapter on oral presentations: Chapter 6, How to highlight the structure, concerns headings, underlining and numbering on the page. Advice about delivering slides is an application of her structure by others, not the book’s.
References
- B. Minto,The Pyramid Principle: Logic in Writing and Thinking. Pearson Education, 2009.
Disclaimer: AI is used for text summarization, polishing and explaining. Authors have verified all facts and claims. In case of an error, feel free to file an issue.