This document discusses different types of communication in organizations. It defines downward communication as communication from higher levels of management to lower levels, such as announcements from a general manager to branch managers. Upward communication is the reverse, with feedback and suggestions flowing from lower to higher levels. Horizontal communication occurs between peers on the same management level, through informal discussions. Diagonal communication cuts across formal lines of authority. Vertical communication refers to the upward and downward flows of information along the formal management structure.