The Rule of Three


Experienced writers know there’s something magic about the number three. You’ve got your three bears, three little pigs, even three billy goats gruff. A stool needs three legs, the federal government has three branches, three strikes and you’re out. Three lights make up a traffic light, three sides make a triangle, and everything starts with “one…two…three… go!” Are you picking up a pattern here?

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Keep in mind the magic of the number three. It’s not written in stone anywhere, but there is something intangibly satisfying about things that come in threes. A five-paragraph essay requires three supporting points because two usually seems weak and four points are hard to remember.

And speaking of remembering, why do you think phone numbers and social security numbers are broken into three parts? It’s easier to remember three-part combinations.

Check out these familiar three-part expressions.


List of  common three-part expressions

The rule of three applies to almost all parallel structures. That doesn’t mean you should force it: a series of two or four can work too. Be aware, however, that groups of three tend to fall sweetly on the ear. This is true in series of nouns:

  • The suitcase was stuffed with fives, tens, and twenties.
  • Jane Austen’s characters often embody charm, wit, and grace.

Also in series of adjectives:

  • The distinguishing marks of a democratic republic are freedom, equality, and responsibility.
  • The sun rose dull, red, and ominous.

And series of verbs:

  • Before winning the day, Madison wrangled, pleaded, and reluctantly negotiated with other Virginian representatives.
  • Overwhelmed by weariness, his eyelids fluttered, drooped, and eventually closed.

The rule of three applies to phrases, clauses, and even entire sentences:

  • The desperate child searched through closets, under beds, and between sofa cushions for his lost blanket.
  • In efforts to gain votes, Watson joined the local country club, Walters began hosting dinner parties, and Garrison began wearing tailored suits. 
  • The last line of defense was the tiger pit. Walter and the boys waited breathlessly for the approaching pirates. To their amazement, the heedless buccaneers walked right into their trap.

Look for opportunities to apply the rule of three to your writing. Groups of three tend to provide a natural cadence, a rhythm that is subconsciously pleasing to the reader.


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About the Author

Brian WaskoBrian is the founder and president of One of his passions is to teach young people how to write better.View all posts by Brian Wasko

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