The 7 Cs of business writing are completeness, conciseness, consideration, clarity, concreteness, courtesy, and correctness. The document provides guidance on each of the 7 Cs, including how to answer all relevant questions to ensure completeness, eliminate unnecessary words to be concise, focus on the reader's benefits and interests to show consideration, use simple language for clarity, include specific examples for concreteness, avoid language that could hurt or insult others to demonstrate courtesy, and check facts and mechanics for correctness. Examples are given for how to apply each of the 7 Cs in business writing.