Writing Matters

How and Why to Make your Lists Parallel (And what does parallel mean?)

In an earlier post, I looked at how to punctuate bulleted lists.  And I promised to address another important rule for bulleted lists: Write parallel lists. What exactly does that mean?

Writing parallel lists simply means that each item in the list has the same structure. To be parallel, each item in the list might

• start with the same part of speech (e.g., noun, verb)
• use the same verb tense (e.g., present, past, future)
• use the same voice (e.g., active or passive)
• use the same sentence type (e.g., statement, question)

For example, in the bulleted list above, each item starts with a verb in the present tense and includes an example in parenthesis. 

So, why does this matter? Similarly structured information—parallelism in bulleted lists—is easier for the reader to process. The reader’s eye (and ear) is primed for the pattern of the information.

It’s easy to see how parallelism helps the reader by looking at—or reading aloud—a list that is not parallel.

Key elements of a successful staff flu vaccination campaign include

• informing employees about the vaccination plan
• educating employees about its importance
• employees should be notified about when they can get flu shots

Huh? Did you have to read this list twice?  Because the first two bullets begin with a verb form ending in ing (a gerund), beginning the third bullet with a noun (employees) is particularly jarring. It violates the structure set up in the first two bullets.

Here’s the list with the third bullet rewritten using the same structure as the first two.

Key elements of a successful staff flu vaccination campaign include

• informing employees about the vaccination plan
• educating employees about its importance
• notifying employees about when they can get flu shots

Better? Parallel bullets set up a rhythm that the reader can rely on.

Parallelism isn’t a new concept. Julius Caesar knew its power:

• I came.
• I saw.
• I conquered.

Simple to read and understand!

Have you had enough about bulleted lists?  Or do you still have a question that you'd like me to  answer in a blog post?

--Marilynne Rudick

Punctuating Bulleted Lists

When USA Today popularized the use of bulleted lists in the early 1980s, I was not a fan.  I railed about the newspaper reducing everything—no matter how complex—to a set of bullet points. What I saw then as a vice, I later realized was a virtue.  Bullets let a writer simplify information and present it in a format that makes it easy for a reader to grasp, and in the case of online information, easy to
scan. 

But as common as bulleted lists have become, there’s little agreement on how to punctuate them.  Whether teaching or editing, one of the questions I am most frequently asked is “What do you put at the end of a bulleted item: comma, semi-colon, period, nothing at all?”

There are no hard-and-fast rules about punctuating bulleted lists.  It’s a matter of style.  I prefer minimal punctuation.  That’s because punctuation’s primary purpose is to provide signposts that tell the reader the relationship of words to each other.