This document provides information on various types of internal written communications used in offices including memorandums, memo reports, office orders, office circulars, and office notes. It describes the purpose and structure of memos and how to effectively write memos. It also explains the differences between memos, letters, office orders, and office circulars. Key details include that memos are used to convey information, instructions, policies, suggestions within an organization and have a standard structure of to, from, date, subject, introduction, discussion, conclusion, and signature. Office orders contain instructions that must be followed while office circulars provide useful information to all departments in a company.