The message is the information that the sender wants to transmit. The medium is the means of communication, such as print, mass, electrical, and digital. As a sender, the supervisor should define the purpose of the message, construct each message with the receiver in mind, select the best medium, time each transmission thoughtfully, and seek feedback. Words can be verbal - written and spoken. Interoffice memos are used for recording informal inquiries or replies.
Letters are formal in tone and addressed to an individual.
They are used for official notices, formally recorded statements, and lengthy communications. Reports are more impersonal and more formal than a letter. They are used to convey information, analyses, and recommendations. Written communications to groups include bulletin-board notices, posters, exhibits, displays, and audio and visual aids. Communication and the need to exchange information are no longer constrained by place and time.