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Muphry's law

Muphry's law is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Muphry's law rather than just read about it. In short: Muphry's law is an adage that states: "If you write anything criticizing editing or proofreading, there will be a fault of some kind in what you have written." The name is a deliberate misspelling of "Murphy's law". History John Bangsund of the Society of Editors (Victoria) in Australia identified Muphry's law as "the editorial application of the better-known Murphy's law", and set it down in March 1992 in the Socie…

Key takeaways

  • Muphry's law belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Muphry's law to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Muphry's law from memory before moving on to harder problems.

Reference excerpt

Muphry's law is an adage that states: "If you write anything criticizing editing or proofreading, there will be a fault of some kind in what you have written." The name is a deliberate misspelling of "Murphy's law".

History John Bangsund of the Society of Editors (Victoria) in Australia identified Muphry's law as "the editorial application of the better-known Murphy's law", and set it down in March 1992 in the Society of Editors Newsletter in his column "John Bangsund's Threepenny Planet". The law, as set out by Bangsund, states that:

(a) if you write anything criticizing editing or proofreading, there will be a fault of some kind in what you have written; (b) if an author thanks you in a book for your editing or proofreading, there will be mistakes in the book; (c) the stronger the sentiment expressed in (a) and (b), the greater the fault; (d) any book devoted to editing or style will be internally inconsistent. In November 2003, the Canberra Editor added the following elaboration:

Muphry's Law also dictates that, if a mistake is as plain as the nose on your face, everyone can see it but you. Your readers will always notice errors in a title, in headings, in the first paragraph of anything, and in the top lines of a new page. These are the very places where authors, editors and proofreaders are most likely to make mistakes. Bangsund's formulation was not the first to express the general sentiment that editorial criticism or advice usually contains writing errors of its own. In 1989, Paul Dickson credited editor Joseph A. Umhoefer with the adage, "Articles on writing are themselves badly written", and quoted a correspondent who observed that Umhoefer "was probably the first to phrase it so publicly; however, many others must have thought of it long ago." An even earlier reference to the idea, though not phrased as an adage, appears in a 1909 book on writing by Ambrose Bierce:

In neither taste nor precision is any man's practice a court of last appeal, for writers all, both great and small, are habitual sinners against the light; and their accuser is cheerfully aware that his own work will supply (as in making this book it has supplied) many 'awful examples'—his later work less abundantly, he hopes, than his earlier. He nevertheless believes that this does not disqualify him for showing by other instances than his own how not to write. The infallible teacher is still in the forest primeval, throwing seeds to the white blackbirds.

Examples Stephen J. Dubner described learning of the existence of Muphry's law in the "Freakonomics" section of The New York Times in July 2008. He had accused The Economist of a typo in referring to Cornish pasties being on sale in Mexico, assuming that pastries had been intended and being familiar only with the word pasties with the meaning of nipple coverings. A reader had alerted him to the existence of the law, and The Economist had responded by sending Dubner a Cornish pasty. In 2009, then-British Prime Minister Gordon Brown hand-wrote a letter of condolence to a mother whose son had died in Afghanistan, in which he misspelled the man's surname. The Sun (a tabloid newspaper) published an article criticising his lack of care. However, in the article, the paper also misspelled the same name and was forced to publish an apology of its own.

Variations Names for variations on the principle have also been coined, usually in the context of online communication, including:

Umhoefer's or Umhöfer's rule: "Articles on writing are themselves badly written." Named after editor Joseph A. Umhoefer. Skitt's law: "Any post correcting an error in another post will contain at least one error itself." Named after Skitt, a contributor to alt.usage.english on Usenet. Hartman's law of prescriptivist retaliation: "Any article or statement about correct grammar, punctuation, or spelling is bound to contain at least one eror [sic]." Named after editor and writer Jed Hartman. The iron law of nitpicking: "You are never more likely to make a grammatical error than when correcting someone else's grammar." Coined by blogger Zeno. McKean's law: "Any correction of the speech or writing of others will contain at least one grammatical, spelling, or typographical error." Named after editor Erin McKean. Bell's first law of Usenet: "Flames of spelling and/or grammar will have spelling and/or grammatical errors." Named after Andrew Bell, a contributor to alt.sex on Usenet. Further variations state that flaws in a printed ("Clark's document law") or published work ("Barker's proof") will only be discovered after it is printed and not during proofreading, and flaws such as spelling errors in a sent email will be discovered by the sender only during rereading from the "Sent" box.

See also Fumblerules – Rule of language or linguistic style that breaks the rule "Hoist with his own petard" – Quote from Hamlet indicating an ironic reversal

References

External links Breaking Muphry's Law, by Mark Nichol. Daily Writing Tips Now presenting… Muphry's Law, by Ben Zimmer. Language Log

Worked examples

Example 1 — a first encounter with Muphry's law

Start with the simplest possible case. Write down what Muphry's law claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Muphry's law before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Muphry's law ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Muphry's law

In research
Muphry's law appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Muphry's law in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Muphry's law is common in secondary-school and first-year university syllabi. It links to neighbouring topics Adages, Copy editing, Nonstandard spelling, so understanding it makes those chapters shorter.
In everyday life
Look for Muphry's law outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Muphry's law in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Muphry's law means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Muphry's law out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Muphry's law in simple terms?

Muphry's law is an adage that states: "If you write anything criticizing editing or proofreading, there will be a fault of some kind in what you have written." The name is a deliberate misspelling of "Murphy's law". History John Bangsund of the Society of Editors (Victoria) in Australia identified…

Why does Muphry's law matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Muphry's law?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Muphry's law.

Tags

  • Adages
  • Copy editing
  • Nonstandard spelling

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