Effective Technical Writing in the Information Age

Apostrophes

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As you already know, apostrophes are used to form both contractions—two words collapsed into one—and possessives. Handily, we can virtually ignore the issue of contractions here, since they are so easily understood and are rarely used in technical writing. With possessives, the apostrophe is used, typically in combination with an "s," to represent that a word literally or conceptually "possesses" what follows it.

a student's paper the county's borders
a nation's decision one hour's passing

Apostrophes with Words ending in "s"

Although practices vary, for words that already end in "s," whether they are singular or plural, we typically indicate possession simply by adding the apostrophe without an additional "s."

Illinois’ law Student Affairs’ office
Mars’ atmosphere interviewees’ answers

Apostrophes with Acronyms and Numbers

In technical writing, acronyms and numbers are frequently pluralized with the addition of an "s," but there is typically no need to put an apostrophe in front of the "s." Therefore, "SSTs" (sea surface temperatures) is more acceptable than "SST’s" when your intention is simply to pluralize. Ideally, use the apostrophe before the "s" with an acronym or a number only to show possession (i.e., "an 1860’s law"; "DEP’s testing") or when confusion would otherwise result ("mind your p’s and q’s").

Possessives without the Apostrophe

Convention, frequency of usage, and—to be honest—the economy of advertising, sometimes dictate that the apostrophe is dropped. In proper names that end in "s," especially of geographic locations and organizations, the apostrophe is often omitted. And in everyday combinations where possession is automatically understood, the apostrophe is often dropped.

United States government Hells Canyon
Veterans Highway Harpers Ferry
mens room Johns Hopkins University

Self-Study

For the confused and curious, here are some "Apostrophes for Dummies" websites:

"Guidelines for Using Apostrophes Correctly" page from about.com

"Using Apostrophes to Show Possession" page from dummies.com