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Occam's Razor
Direct answer
Occam's Razor: Occam's razor is the rule of thumb that, among explanations that account for the same facts, the one resting on the fewest assumptions should be preferred.
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At a glance
- Also called
- occams razor, ockham's razor, principle of parsimony, law of parsimony
- Found in
- Consciousness & Spiritual Psychology
- Related
- Falsifiability, Burden of Proof, Conspiracy Theory, Proportionality Bias
Occam's razor is the rule of thumb that, among explanations that account for the same facts, the one resting on the fewest assumptions should be preferred.
A plain educational schematic; it does not diagnose a condition or replace professional care.
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What is Occam's razor in simple terms?
Occam's razor is a principle of economy in explanation. If two accounts fit the evidence equally well, the one that assumes less is the better bet, because each added assumption is another thing that could be false. It is called a razor because it shaves away what is not needed.
Occam's Razor is often misquoted as the simplest answer is usually right. The rule is narrower: it compares explanations that fit the facts equally, and it counts assumptions, not ease of telling. A plot involving thousands of silent people needs many assumptions. A blunder by a few needs fewer. The razor does not say the blunder is the truth, only where to look first.
On the tree of the hidden arts: Conspiracies, examined.
What sets Occam's Razor apart
The razor counts assumptions, and that is its whole content. It says nothing about which story is shorter to tell or more pleasing. Ockham used it mainly in theology and logic, to deny that universals such as redness exist as things apart from red objects. Scientists adopted it as a working habit, and statisticians later gave it numerical form in methods that penalise a model for every extra adjustable part.
- Named for: William of Ockham, English Franciscan, about 1287 to 1347
- His wording: plurality is never to be posited without necessity
- Famous wording: entities are not to be multiplied beyond necessity, a later phrasing
- Also called: the principle of parsimony
- A counterweight: Walter Chatton's anti-razor: add what an explanation truly needs
Often mistaken for something else: Occam's razor ranks explanations that fit the facts equally; it gives no licence to prefer a neat story over one that fits the facts better.
The story behind Occam's Razor
The rule is named after William of Ockham, an English Franciscan friar and philosopher who died in 1347. He used it often, in forms such as plurality is never to be posited without necessity, though the idea goes back to Aristotle and the best known Latin wording is not found in his works. The name Occam's razor came into use centuries later.
Why Occam's Razor matters
Occam's Razor gives a fair first step when several stories fit the same facts, by asking what each one has to assume.
How to read Occam's Razor
Readers list what each explanation requires to be true and start with the shortest list, keeping the others open.
Occam's Razor in practice: an example
Keys missing from the hook are more likely mislaid than stolen by someone who took nothing else: one assumption against several.
Where readings of Occam's Razor go wrong
Occam's Razor is a guide to where to look first and settles nothing; the world is sometimes complicated, and the leaner story is sometimes wrong.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Consciousness & Spiritual Psychology
- Aliases
- occams razor, ockham's razor, occams razor meaning, principle of parsimony, law of parsimony
- Last updated
- 2026-09-26
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Common questions
What is Occam's razor in simple terms?
When two explanations fit the facts equally well, prefer the one that has to assume less. Every extra assumption is one more thing that might be untrue.
Who invented Occam's razor?
It is named after William of Ockham, a fourteenth-century English friar who used the principle often. The idea is older, found in Aristotle, and the name was given long after his death.
Does Occam's razor prove the simplest answer is true?
No. It is a rule for choosing which explanation to test first. Evidence decides, and there are many cases where the more complicated account turned out to be correct.
