This document discusses different mediums for communication like email, tweets, memos, letters, and reports. It explains that the medium should be chosen based on the situation and audience, as some situations dictate the medium. Email is fast but can be hard to format, tweets are immediate but casual, memos are for internal use but slower than email, letters are usually formal, and reports allow for fuller discussion. The document stresses that the medium and organization of a communication should depend on its purpose, strategy, and intended audience.