The document discusses 9 principles of effective business writing: correctness, conciseness, clarity, completeness, concreteness, consideration, courtesy, confidence, and conversational tone. Each principle is defined and guidelines are provided for how to achieve each one. Correctness involves using the appropriate language, facts, and writing mechanics. Conciseness means avoiding unnecessary words and repetition. Clarity requires choosing clear language and examples. Completeness means including all relevant information. Concreteness means using specific language and active verbs. Consideration means understanding the reader's perspective. Courtesy means being respectful and prompt. Confidence means having a positive tone. A conversational tone makes the writing natural and easy to understand.