The Elements of Style ("Strunk & White") is an American English writing style guide. It is one of the most influential and best-known prescriptive treatments of English grammar and usage in the United States. It originally detailed eight elementary rules of usage, ten elementary principles of composition, "a few matters of form," and a list of commonly misused words and expressions. Updated editions of the paperback book are often required reading for American high school and college composition classes. — Excerpted from The Elements of Style on Wikipedia, the free encyclopedia.