3.3 Lists

Lists, when used correctly, can be a technical writer’s—and reader’s—best friend. Lists allow you to emphasize important ideas. They also increase the readability of text by simplifying long sentences or paragraphs and adding aesthetic passive space to make reading more pleasant. However, using the wrong kind of list or poorly formatting a list can create confusion rather than enhance readability. Therefore, it is important to understand the various types of lists and how and why to use them.

Example Lead-in Sentences for Lists

Adhere to the following guidelines when creating lists of any kind:

  • Include between 2-8 items in a list. You must have at least two items in a list (or it’s not a list; it’s just an item). Avoid having more than 8 items in a list, as too many items can have the reverse effect. If you emphasize too many ideas, you end up emphasizing nothing. NASA recommends no more than 8 steps in an emergency procedure; more than 8 can be overwhelming in a crisis situation.
  • Try to avoid splitting a list over two pages if possible.
  • Avoid overusing lists. A list should always have explanatory text around it to indicate what this is a list of and why it is needed. A series of lists does not give a reader adequate information and context.
  • Adjust spacing before, after, and within lists to enhance readability. Avoid having a list of information all scrunched up into a dense block of text; this defeats the purpose of enhancing readability.
  • Capitalize the first letter of each list item.
  • Use parallel phrasing for each listed item (note that each item in this list starts with a verb that is bolded only to catch your attention, not as a style you must follow).
  • Never use a heading to introduce a list.

Each kind of list is suited for specific purposes. All lists must conform to a set of rules of construction and formatting. Learning to use the Paragraph formatting tool in Word (see Figure 3.3.1) is crucial to designing effective lists.

Figure 3.3.1 Screenshot of Paragraph tools in Word 2010; you can auto-create lists using the top left buttons.

NOTE: If you are making lists by hitting ENTER then TAB and then a dash, you are doing it wrong, and this will make future editing and maintaining readability very difficult if not impossible. Especially when writing documents collaboratively that will need extensive revision and editing, you must make sure to use the correct formatting tools.

Common Types of Lists

Just as bar graphs serve a different purpose than pie charts, different kinds of lists also serve different purposes. This section will describe when and how to use the following five commonly used types of lists:

  • Bullet Lists: use when order of listed items is not important
  • Numbered Lists: use when order is important, such as steps in instructions
  • In-sentence Lists: use when you want to maintain sentence structure and paragraphing, and have a short list (2-4 items)
  • Labeled Lists: use when the listed items require some explanation or amplification (like this one)
  • Nested Lists: use when listed items have sub-lists (list within a list).

Bullet Lists

Bullet lists are the most commonly used kind of list. They are effective when

  • You want to emphasize two or more items
  • You can place the items in any order (no particular order is required)
  • You want to add white space to your document to enhance readability.

Bullet list items should generally be short (a word or a phrase). If you find your bulleted items are longer than this, consider using another kind of list, such as a labeled list or a nested list.

Numbered Lists

Use numbered lists when the order of the listed items is important and ideas must be expressed in chronological order. For example, use a numbered list when you must enumerate a series of steps in instructions, or when you are introducing ideas that will be discussed in a certain order in the following text. If you have a list of more than 8 items, consider breaking up the list in two or more stages or categories (Steps in Stage 1, Steps in Stage 2, etc.).

Sample Numbered List

Revision of your document should be undertaken in 4 stages done in the following order:

  1. Check formatting for readability
  2. Review content to ensure the document contains all necessary information
  3. Edit sentence style and structure to ensure ideas are clearly and correctly expressed in a formal and precise manner
  4. Proofread for grammar, spelling, punctuation and usage errors.

NOTE:  The 4 steps in the sample numbered list each begin with a verb (check, review, edit, and proofread), indicating what the reader should do, and the numbers indicate the order in which these steps should be performed.

In-Sentence Lists

Use in-sentence lists when you want to (a) keep paragraph style, (b) to avoid having too many lists on one page, and (c) when the list items are relatively short and can be expressed in a sentence clearly without creating a run-on. The previous sentence is an example of an in-sentence list. Note that a bracketed, lower-case letter introduces each listed item.

Typically, in-sentence lists have 2-4 items. Generally avoid putting more than 4 items in this kind of list (unless they are very short), or your sentence might become difficult to read.

Labeled Lists

Use a labeled list when you are listing items that need further explanation. These can be bulleted or numbered. Start the list item with the word or term (the “label”), placed in italics (or bold) and followed by a colon. After the colon, write the explanation or amplification of the term or concept in normal body text.

Sample Labeled Lists (two formats)

The course assessment plan includes three main written assignments given in the following order:

  1. Report One: an internal proposal written in Memo format
  2. Report Two: an internal proposal written in Short Report format
  3. Report Three: A comparative recommendation report written for an external client in Long Report format.

The plan also includes two oral presentations:

  • Presentation 1: Individual or pair presentation on a technical writing topic (worth 5%)
  • Presentation 2: Team presentation giving a progress report on Report 3 (worth 10%).

Make sure the label portions (before the colon) are phrased consistently and either italicized or bolded for emphasis; try to make the explanations that follow roughly equal in length and detail.

Nested Lists

A “nested” list is a list-within-a-list or a list with sub-listed items. These can be useful for avoiding overly long bullet lists by categorizing items into sub-lists. Note the long bullet list on the left does not effectively categorize items, so emphasis is lost. The Nested List is more effective.

Sample Bullet List (too long)
Sample Nested List

Every restaurant should contain the following beverage containers:

  • Coffee cups/mugs
  • Latte bowls
  • Tea cups
  • Travel mugs
  • Water glasses
  • Red Wine glasses
  • White wine glasses
  • Beer glasses
  • Beer steins
  • Cocktail glasses
  • Shot glasses
  • Reusable plastic cups.

(12 items is too many for one list!)

Every restaurant should contain the following kinds of beverage containers:

  • Hot beverage containers

    • Coffee mugs/cups
    • Latte bowls
    • Tea cups
    • Travel mugs
  • Cold beverage containers
    • Water glasses
    • Red wine glasses
    • White wine glasses
    • Beer glasses
    • Beer steins
    • Cocktail glasses
    • Shot glasses
    • Reusable plastic cups.

This is not an exhaustive list of the kinds of lists you may run across in your technical reading. These are simply the most common kinds of lists, and ones you should be able to identify and use effectively in your technical writing assignments to enhance readability.

A Note on Punctuating the End of List Items

Conventions for punctuating list items vary depending on the context. Legal writing tends to use more punctuation than technical writing (list items often end in semicolons and the final item is introduced by an “and”). In technical documents, because this style favors simplicity, you typically place a period only after the final item in your list. If each listed item has complete sentences within it, then you will place a period at the end of each list item. If you have a simple bullet list, you may omit the final period.

EXERCISE 3.3 Identify the document design errors in the following example

Five Kinds of List:

  1. Bullet lists
  2. numbered lists.
  3. Lists can be written within a sentence using bracketed letters to introduce the list items.
  4. nested list
    • Also called a “list within a list”
  5. Labeled List

H5P: Document Design Errors

We have identified at least 5 errors in this bulleted list. Review the image above (Exercise 3.3) and answer the following questions by dragging the words into the correct boxes.

  1. What is the error the writer has made concerning the heading?
  2. In bullet 1, what error do you notice?
  3. What is the first error you notice in bullet 2?
  4. Is there an error in bullet number 3?
  5. What error do you notice in bullet 4?
  6. There are two errors in bullet 5, what is the first error?
  1. no
  2. capitalization of the second word
  3. lead-in sentence
  4. needs to be capitalized
  5. the text is over too far
  6. not over far enough

Integrating Lists into Body Text

Just as there are rules for constructing lists, there are rules for how to incorporate them into your text. Most importantly, a list must be introduced by a lead-in sentence (or clause) that contains both a subject and a verb. Technical writers often use the expression “the following” somewhere in the lead-in sentence to clearly indicate that a list of items will follow.

If the lead-in is a complete sentence (ie. it could end in a period), it should end in a colon that introduces the listed items. If the sentence is not a complete thought, (ie. you could not put a period there) the lead-in should not end in any punctuation, and each listed item must be able to grammatically complete the lead-in sentence.

Example Lead-in Sentences for Lists

Complete lead-in sentence (ends in a colon)The term design project must allow students to incorporate the following elements into their solution:

  • Mechanical engineering principles
  • Electrical engineering knowledge
  • Software/programming basics.

Partial lead-in sentence (no punctuation after lead-in)

The term design project must allow students to design a solution using

  • Mechanical engineering principles
  • Electrical engineering knowledge
  • Software/programming basics.

GRAMMAR TIP: One of the most common errors found in technical reports has to do with the introduction of lists and how these are punctuated. Here are some additional examples of how—and how NOT—to introduce lists.

Don’t use a colon before a list unless the introduction to the list is a complete thought, that is, an independent clause. Remember this rule: if you can’t put a period there, then you can’t put a colon there.

Examples of correct and incorrect uses of a colon in a list
Correct Incorrect
Uses a colon

Pandas have the following traits:

  • Black and white fur
  • Vegetarian diet
  • Excellent problem-solving skills.

Common characteristics of pandas include:

  • Black and white fur
  • Vegetarian diet
  • Excellent problem-solving skills.
Does not use a colon

Pandas are

  • Black and white
  • Vegetarian
  • Intelligent.

Here are some common characteristics of pandas

  • Black and white fur
  • Vegetarian diet
  • Excellent problem-solving skills.

In some cases, a list might not be helpful and instead might just over-complicate your document. In such cases, list your ideas in sentence form, within the paragraph, as in the final panda example below. A page with too many lists looks like an outline instead of a coherently expressed series of ideas.

Example: Pandas have black and white fur, eat a vegetarian diet, and can solve difficult problems.

EXERCISE 3.4 When to use a colon with a list.

H5P: Using Colons with Lists

Which of the following lead-ins should end in a colon? Which should end with no punctuation? Write “colon” or “no colon” in the space provided at the end of the sentence.

  1. Our solution aims to meet the following objectives
  2. The design constraints that must be considered are
  3. All proposed designs must abide by the following constraints
  4. The proposed solution offers the following tangible benefits
  5. The proposed solution offers many tangible benefits, such as

Review the types of lists with this interaction.

EXERCISE 3.5 Identify the types of lists below

H5P: Types of Lists.

  1. List type:
    Revision of your document should be undertaken in 4 stages:

    1. Check formatting for readability
    2. Review content to ensure the document contains all necessary information in a logical order
    3. Edit sentence style and structure to make sure it is formal, clear, and correct
    4. Proofread for grammar, punctuation, spelling, and format errors.
  2. List type:
    The assessment plan for this course includes three main writing tasks:

    • Report 1: an internal proposal written in memo format
    • Report 2: an internal proposal written in short report format
    • Report 3: an external Comparative Recommendation Report, written in long report format.
  3. List type:
    The 7 Cs refers to seven characteristics of effective professional writing. This writing should be

    • Clear
    • Concise
    • Concrete
    • Coherent
    • Correct
    • Complete
    • Courteous
  4. List type:
    The term design project tests your knowledge of the following principles:

    • Mechanical engineer
      • Forces
      • Torque
      • Gear trains
    • Electrical engineering
      • Sensors
      • Circuits.


  1. Create your own list, using the Paragraph Tools in Word. For example, make a list of as many kinds of vehicles as you can think of, being as creative as you can. If you can think of more than 8, consider what kind of list would be most suitable.
    1. Could you categorize them into nested lists? What kind of categories?
    2. Consider what text would introduce and follow your list.
    3. What kind of document would contain a list of vehicle types? Who would read it?
  2. Read Farkas’ article on “Understanding and using PowerPoint” [PDF][1] and create a set of bullet-listed notes summarizing his ideas on “Criteria for Creating Bullet Points.”

Review the Lists [PPTX].

Media Attributions

  • Figure 3.3.1 Screenshot of Paragraph tools in Word 2010; you can auto-create lists using the top left buttons by Suzan Last is licensed under a CC BY 4.0 licence.

  1. D. K. Farkas, “Understanding and using PowerPoint,” STC Annual Conference Proceedings, May 2005, pp. 313-320.


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Technical Writing Essentials - H5P Edition Copyright © 2022 by Suzan Last is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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