Networks are another aspect of direction and flow of communication. Bavelas has shown that communication patterns, or networks, influence groups in several important ways. Communication networks may affect the group's completion of the assigned task on time, the position of the de facto leader in the group, or they may affect the group members' satisfaction from occupying certain positions in the network. Although these findings are based on laboratory experiments, they have important implications for the dynamics of communication in formal organizations.
There are several patterns of communication:
• "Chain",
• "Wheel" and "Star",
• "All-Channel" network,
• "Circle".
The Chain can readily be seen to represent the hierarchical pattern that characterizes strictly formal information flow, "from the top down," in military and some types of business organizations. The Wheel can be compared with a typical autocratic organization, meaning one-man rule and limited employee participation. The Star is similar to the basic formal structure of many organizations. The All-Channel network, which is an elaboration of Bavelas's Circle used by Guetzkow, is analogous to the free-flow of communication in a group that encourages all of its members to become involved in group decision processes. The All-Channel network may also be compared to some of the informal communication networks.
If it's assumed that messages may move in both directions between stations in the networks, it is easy to see that some individuals occupy key positions with regard to the number of messages they handle and the degree to which they exercise control over the flow of information. For example, the person represented by the central dot in the "Star" handles all messages in the group. In contrast, individuals who