A style guide or manual of style is a set of standards for the writing, formatting and design of documents. It is often called a style sheet, although that term also has multiple other meanings. The standards can be applied either for general use, or be required usage for an individual publication, a particular organization, or a specific field.
A style guide establishes standard style requirements to improve communication by ensuring consistency both within a document, and across multiple documents. Because practices vary, a style guide may set out standards to be used in areas such as punctuation, capitalization, citing sources, formatting of numbers and dates, table appearance and other areas. The style guide may require certain best practices in usage, language composition, visual composition, orthography and typography. For academic and technical documents, a guide may also enforce the best practice in ethics (such as authorship, research ethics, and disclosure), pedagogy (such as exposition and clarity), and compliance (technical and regulatory).
Style guides are specialized in a variety of ways, from the general use of a broad public audience, to a wide variety of specialized uses, such as for students and scholars of various academic disciplines, medicine, journalism, the law, government, business in general, and specific industries. The term house style refers to the individual style manual of a particular publisher or organization.
Style guides vary widely in scope and size.
A short style guide is often called a style sheet. A comprehensive guide tends to be long and is often called a style manual or manual of style (MOS or MoS). In many cases, a project such as one book, journal, or monograph series typically has a short style sheet that cascades over the somewhat larger style guide of an organization such as a publishing company, whose content is usually called house style. Most house styles, in turn, cascade over an industry-wide or profession-wide style manual that is even more comprehensive. Some examples of these industry style guides include the following:
- AP style for journalism and some business writing
- Chicago style for some business writing and corporate communications, as well as academic writing and publishing
- USGPO style or AGPS style for government publications
- Oxford style for academic publishing and readership
- APA style and ASA style for the social sciences
- CSE style for various physical sciences
- ACS style for chemistry
- AMA style for medicine
- Bluebook style for law
Finally, these reference works cascade over the orthographic norms of the language in use (for example, English orthography for English-language publications). This, of course, may be subject to national variety such as the different varieties of American English and British English.
Style guides that cover usage may suggest ways of describing people that avoid racism, sexism, and homophobia. Guides in specific scientific and technical fields cover nomenclature, which specifies names or classifying labels that are preferred because they are clear, standardized, and ontologically sound (e.g., taxonomy, chemical nomenclature, and gene nomenclature).
Most style guides are revised from time to time to accommodate changes in conventions and usage. The frequency of updating and the revision control are determined by the subject matter. For style manuals in reference work format, new editions typically appear every 1 to 20 years. For example, the AP Stylebook is revised annually, and the Chicago, APA, and ASA manuals are in their 17th, 7th, and 4th editions, respectively. Many house styles and individual project styles change more frequently, especially for new projects.
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- But the stylebook says ... – Blog post about stylebook abuse, by Bill Walsh of The Washington Post
- Handouts about writing style guides, from a conference of the American Copy Editors Society in 2007
- Language Log » Searching 43 stylebooks