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My understanding is that the toughest standard regarding plagiarism is the "five (consecutive) word" rule, which holds that, if there are five consecutive words identical to someone else's writing, then you are guilty of plagiarism.

This does not apply to, say, proper names like "The Loyal Order of Freemasons", which is considered one word, not five, but what about proverbs or trite expressions such as "My country right or wrong"?

My further understanding is that there are also "looser" standards for determining plagiarism (for example, ten or twenty consecutive "copied" words). When do such standards apply, and when does the five word standard apply?

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Five consecutive words of original, creative expression - an original creation of the author you're "plagiarizing". If it's not their own original creation, the status of the original comes into play - plagiarizing a plagiarist is plagiarizing the original, but if the original is a part of the public culture, it can't be plagiarized, not once and not twice. –  SF. Apr 3 '13 at 12:41

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I haven't heard this five-word rule. But I can easily think of many sequences of five words that no one would seriously consider plagiarism.

I think that I will

was the first time that

Britain, France, Germany, and Italy

all men, women, and children

March 1 of this year

turn left at the traffic light (that's six!)

five words in a row

Etc etc.

If some university or whatever institution is classifying as "plagiarism" any use of five words in a row that have ever previously been used anywhere in the world, I think that every student there, not to mention every faculty member, is guilty of plagiarism.

You can't rationally define plagiarism simply in terms of the number of words that are the same. Many short strings of words like those above are the most simple and direct way of expressing a common idea. If you never heard one of those phrasings before, you'd be likely to invent it.

I'm reminded of a TV comedy I saw years ago where a writer of home repair books was accused of plagiarism. And so in court the other writer's lawyer read samples from the two books that were word-for-word identical. Statements like, "Attach the faucet using two screws." At one point the defendant says, "How many ways are there to say, 'Attach the faucet using two screws.' 'Put in the two screws to attach the faucet.' 'Screw in the faucet with two screws.' 'See the two screws? Put 'em in.'"

On the other hand I can think of many short phrases that surely would be plagiarism. Like, "I have nothing to offer but blood, toil, tears, and sweat." "The ultimate question of life, the universe, and everything." "In the beginning, God created the heavens and the earth." "I think, therefore I am." (That's only three words in the original Latin: "Cogito, ergo sum.") If you used one of those strings of words in a way that implied it was original, I think you would be guilty of plagiarism.

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Plagiarism is an ethical concept, not a legal one, so there is no universal accepted standard. The 'five-consecutive word' is a rule of thumb, not a legal precept. If you are writing for a particular forum, they may have anti-plagiarism guidelines. This is universally true for universities and other educational institutions, you should check your student handbook if this applies to you. These sorts of institutions actually have software comparing student work to other sources, giving details on the points of comparison.

Quotes, properly attributed, are always allowable within reason (you can't "quote" the entire New York Times on your blog without running into legal trouble). Cliches are typically quotes that have lost their attribution through long use (although your 'My country, right or wrong' is part of a longer Stephen Decatur statement). Cliches are generally open for use, but are also boring and lazy writing.

Otherwise, use your best judgment. If you're actually to the point of counting individual words in common, my guess is that your writing is too close to the original. And no fair changing up one or two words or just changing the word order slightly. It's unethical and, possibly more to the point, doesn't work.

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RE changing one or two words: Yes. If you said "My nation, right or wrong" and presented that as an original quote, I don't think you'd get away with it. But change enough words and at some point you cross the line out of plagiarism. Like I doubt you'd get in trouble for, "I love my nation, even though it has flaws." –  Jay May 15 at 18:39

I have never heard of the 5-word rule you describe, and I would find it hard to believe that anyone in a serious academic environment would abide by such a standard.

Its interesting you bring this up, I recently launched a plagiarism detection software, and one of the most important things I built into it was the ability to detect sentences and phrases that are highly common, in order for the algorithm to essentially ignore them. It would be pretty silly if a professor accused a student of plagiarizing the following 5-word phrase: "during my trip to the"...

Google currently shows about 779k exact matches on the internet for that 5-word phrase...

As Jay states, there are countless number of 5-word phrases that people repeat over and over. Plagiarism cannot have a one size fits all rule, you have to use your own discretion and judgement. So I would abandon the idea that this 5-word rule is any kind of "standard".

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