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Outline (list)

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Outline (list)

An outline, also called an hierarchical outline, is a list arranged to show hierarchical relationships and is a type of tree structure. It is used[1] to present the main points or topics of a given subject, often used as a rough draft or summary of the content of a document.[2] Preparation of an outline is an intermediate step in the process of writing a scholarly research paper, literature review, thesis or dissertation. A special kind of outline (integrated outline) incorporates scholarly sources into the outline before the writing begins. [3]

Writers of fiction and creative nonfiction, such as Jon Franklin,[4] may use outlines to establish plot sequence, character development and dramatic flow of a story, sometimes in conjunction with free writing.

Merriam-Webster's manual for writers and editors (1998, p. 290) recommends that the section headings of an article should, when read in isolation, combine to form an outline of the article content. Garson (2002) distinguishes a 'standard outline', presented as a regular table of contents from a refined tree-like 'hierarchical outline', stating that "such an outline might be appropriate, for instance, when the purpose is taxonomic (placing observed phenomena into an exhaustive set of categories). ... hierarchical outlines are rare in quantitative writing, and the researcher is well advised to stick to the standard outline unless there are compelling reasons not to."[5]


  • Outline organization 1
  • Types of outlines 2
    • Outline styles 2.1
      • Sentence outline 2.1.1
      • Topic outline 2.1.2
      • A sample topic outline application: An outline of human knowledge 2.1.3
    • Outlines with prefixes 2.2
      • Bare outlines 2.2.1
      • Alphanumeric outline 2.2.2
      • Decimal outline 2.2.3
      • Integrated Outline 2.2.4
  • See also 3
  • Notes 4
  • References 5

Outline organization

An outline is a list of items, organized according to some consistent principle.[1] Each item may be divided into additional sub-items. Each organizational level in an outline has at least two subcategories as advised by major style manuals in current use.[6]

Types of outlines

Outline styles

Sentence outline

A sentence outline is a hierarchical outline composed of sentences. Each includes a heading or single sentence of a planned document about the subject of the outline. It is the type of outline typically used to plan the composition of books, stories, and essays. It can also be used as a publishing format, in which the outline itself is the end product.

Topic outline

A topic outline is a hierarchical outline composed of topics. Each entry is a subtopic of the subject of the outline. One application of topic outlines is the college course overview, provided by professors to their students, to describe the scope of the course. Another application is as a subject outline, such as for an encyclopedia.

A sample topic outline application: An outline of human knowledge

Propædia is the historical attempt of the Encyclopædia Britannica of presenting a hierarchical "Outline of Knowledge" in a separate volume in the 15th edition of 1974. The "Outline of Knowledge" was a project by Mortimer Adler. Propædia had three levels, 10 "Parts" at the top level, 41 "Divisions" at the middle level and 167 "Sections" at the bottom level, numbered, for example "1. Matter and Energy", "1.1 Atoms", "1.1.1. Structure and Properties of Atoms".

Outlines with prefixes

A feature included in many outlines is prefixing. Similar to section numbers, an outline prefix is a label (usually alphanumeric or numeric) placed at the beginning of an outline entry to assist in referring to it.

Bare outlines

Bare outlines include no prefix.

Alphanumeric outline

An alphanumeric outline includes a prefix at the beginning of each topic as a reference aid. The prefix is in the form of Roman numerals for the top level, upper-case letters (in the alphabet of the language being used) for the next level, Arabic numerals for the next level, and then lowercase letters for the next level. For further levels, the order is started over again. Each numeral or letter is followed by a period, and each item is capitalized, as in the following sample:

Some call the Roman numerals "A-heads" (for "A-level headings"), the upper-case letters, "B-heads", and so on. Some writers also prefer to insert a blank line between the A-heads and B-heads, while often keeping the B-heads and C-heads together.

If more levels of outline are needed, lower-case Roman numerals and numbers and lower-case letters, sometimes with single and double parenthesis can be used, although the exact order is not well defined, and usage varies widely.

The scheme recommended by the MLA Handbook,[7] and the Purdue Online Writing Lab,[8] among others, uses the usual five levels, as described above, then repeats the Arabic numerals and lower-case letter surrounded by parentheses (round brackets) – I. A. 1. a. i. (1) (a) – and does not specify any lower levels,[7][8] though "(i)" is usually next. In common practice, lower levels yet are usually Arabic numerals and lower-case letters again, and sometimes lower-case Roman again, with single parentheses – 1) a) i) – but usage varies. MLA style is sometimes incorrectly referred to as APA style,[9] but the APA Publication Manual does not address outline formatting at all.

A very different style recommended by The Chicago Manual of Style,[1][10] based on the practice of the United States Congress in drafting legislation, suggests the following sequence, from the top to the seventh level (the only ones specified): I. A. 1. a) (1) (a) i) – capital Roman numerals with a period, capital letters with a period, Arabic numerals with a period, italic lowercase letters with a single parenthesis, Arabic numerals with a double parenthesis, italic lowercase letters with a double parenthesis, and italic lowercase Roman numerals with a single parentheses, though the italics are not required). Because of its use in the US Code and other US law books, Many American lawyers consequently use this outline format.

Another alternative scheme repeats all five levels with a single parenthesis for the second five – I) A) 1) a) i) – and then again with a double parenthesis for the third five – (I) (A) (1) (a) (i).

Many oft-cited style guides besides the APA Publication Manual, including the AP Stylebook, the NYT Manual, Fowler, The Guardian Style Guide, and Strunk & White, are curiously silent on the topic.

One side effect of the use of both Roman numerals and upper-case letters in all of these styles of outlining is that, in most alphabets, "I." may be an item at both the top (A-head) and second (B-head) levels. This is usually not problematic, because lower level items are usually referred to hierarchically. For example, the third sub-sub-item of the fourth sub-item of the second item is item II. D. 3. So, the ninth sub-item (letter-I) of the first item (Roman-I) is item I. I., and only the top level one is item I.

Decimal outline

The decimal outline format has the advantage of showing how every item at every level relates to the whole, as shown in the following sample outline:

Integrated Outline

An integrated outline is a helpful step in the process of organizing and writing a scholarly paper (literature review, research paper, thesis or dissertation). When completed the integrated outline contains the relevant scholarly sources (author's last name, publication year, page number if quote) for each section in the outline. An integrated outline is generally prepared after the scholar has collected, read and mastered the literature that will be used in the research paper. Shields and Rangarajan (2013) recommend that new scholars develop a system to do this. Part of the system should contain a systematic way to take notes on the scholarly sources.[11] These notes can then be tied to the paper through the integrated outline. This way the scholar reviews all of the literature before the writing begins.

An integrated outline can be a helpful tool for people with

  • Mary Ellen Guffey, "Organizing and Writing Business Messages," Business Communication: Process and Product, p. 160-161.
  • "Numbers: Lists and Outlines," Manual for Writers and Editors (Merriam-Webster, Incorporated: 1998), p. 103.
  • White, Basil (1996) Developing Products and Their Rhetoric from a Single Hierarchical Model, 1996 Proceedings of the Annual Conference of the Society for Technical Communication, 43, 223-224. [2]
  • Purdue UniversityOWL: Online Writing Lab,
  • Encyclopædia Britannica Online (Accessed January 5, 2006)Britannica Student Encyclopedia,"Report writing,"
  • (Accessed January 5, 2006)World Book OnlineWilliam E. Coles, Jr. "Outline,"
  • Ted Goranson's About this Particular Outliner 'Outlining and Styles'
  • Jon Franklin "Writing for Story", Penguin 1994.


  1. ^ a b c "Lists and Outlines (6.121–126)". Chicago Manual of Style (16th ed.). Chicago: U. of Chicago Press. 2010. 
  2. ^ OED: "outline n.3.a. In pl. The main features or general principles of a subject, proposal, etc. 3.b. A brief verbal or written description of something, giving a general idea of the whole but leaving details to be filled in; a rough draft, a summary. Also: a précis of a proposed article, novel, scenario, etc."
  3. ^ Shields, Patricia M. 2004.Step by Step: Building a Research Paper. Stillwater OK: New Forums Press. ISBN 1-58107-117-5
  4. ^ Writing for Story, Penguin, 1994
  5. ^ G. David Garson, Guide to writing empirical papers, theses, and dissertations. CRC Press, 2002, ISBN 978-0-8247-0605-0, chapter "Typical Outlines", pp. 23-34.
  6. ^ The following is certainly not an exhaustive list of relevant style guides:
    • Turabian, K. L (2003). A Manual for Writers of Research Papers, Theses, and Dissertations (7th ed.). Chicago: U. of Chicago Press. pp. 63–64. You should have at least two items to list at each level; if you do not, reconsider the structure of the outline. 
    • Gibaldi, J (2003). MLA Handbook for Writers of Research Papers (6th ed.). New York: Modern Language Association of America. p. 53. Logic requires that there be a II to complement a I, a B to complement an A, and so on. 
    • Tardiff, Elyssa; Brizee, Allen (2010-01-08). "Four Main Components for Effective Outlines". Retrieved 2010-04-02. Division - How do I accomplish this? Each heading should be divided into 2 or more parts. 
    • "How to Make an Outline" (PDF). Psychology Writing Center, U. of Washington. Retrieved 2010-04-02. Both topic and sentence outlines follow rigid formats... By convention, each category consists of a minimum of two entries. 
    • "How to Write an Outline". Los Angeles City College Library Online. Retrieved 2010-04-02. Each heading and subheading must have at least two parts. 
  7. ^ a b "1.8.3: Final Outline". MLA Handbook for Writers of Research Papers (Seventh ed.). New York, NY: Modern Language Association of America. 2009. p. 45.  
  8. ^ a b "Developing an Outline". Purdue Online Writing Lab.  
  9. ^ For example: "APA Outline Format Examples". 2011. Retrieved 20 October 2011. 
  10. ^ "Lists and Outline Style (6.124–130)". Chicago Manual of Style (15th ed.). Chicago, IL: U. of Chicago Press. 2003. pp. 270–275.  
  11. ^ Shields, Patricia and Rangarjan, N. 2013. A Playbook for Research Methods: Integrating Conceptual Frameworks and Project Management. [1]. Stillwater, OK: New Forums Press. See Chapter 8 for a detailed discussion of an integrated outline with examples.
  12. ^ Shields, Patricia. 2014. Tools for Excellent Papers: 2014 ASPA Student Summit. Presentation at the American Society for Public Administration annual conference, Washington DC March 15, This powerpoint describes a system for writing paper that contains an integrated outline. Slides 37 - 46 examine the components of an integrated outline with an example.


See also


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