This document provides an overview of interpersonal skills, types of business messages, and principles of business writing style. It discusses defining interpersonal skills, choosing positive language, and considering the audience and purpose for different types of messages. The document also outlines five principles for business prose: write concisely, use action verbs, write in the active voice, use shorter sentences and paragraphs, and appropriately use business jargon. It provides examples and case studies on writing a refund letter, memo report, and email.