The document provides guidance on creating a business letter, including its purpose, format, required parts, and acceptable styles. It explains that a business letter is written to provide information, serve as evidence, build goodwill, or for convenience. The required parts are the letterhead or heading, dateline, inside address, salutation, body, complimentary closing, signature, and optional typist's initials and enclosures. Acceptable formats are block or modified block, while punctuation styles can be open or mixed. Examples of each combination are also provided.