These five channels can also be divided into formal and informal communication. Formal communication channels are planned and established by the organization. Informal channels allow information to be carried outside formal channels. Downward communication is the most common communication system used in an organization. This is the communication style that deals with the flow from a manager to a subordinate.
Upward communication is the communication method used by subordinates to their supervisors.
Communication between manager to manager, or coworker to coworker is known as horizontal communication. This communication method involves work flow between peers with little or no control by managers. Grapevines are formed informally through general conversation amongst peers. Networks are established by workers with similar interests inside and outside of the working environment. The productive manager understands the communication systems within their organizations.