This document provides guidance on writing a proper business letter, outlining the key components and their order. It discusses the letterhead, date line, inside address, salutation, body, complimentary closing, signature, and other optional elements. The body should be concise yet justify the purpose clearly across 3 paragraphs. Formatting options include block or modified block, and letters should be neatly typed or written with correct grammar, spelling and margins. Students are assigned to write a practice letter inviting a business contact to dinner as a homework assignment.