Lewin, K. A dynamic theory of personality. Lewin, K. Principles of topological psychology. Schein A group therefore can be defined as two or more individuals engaged in some social interaction, for the purpose of achieving some goal or goals. In the work situation these goals are usually work related if the group is a formal working group. The group behaviour model considers those factors outside the group itself and acknowledges environment , individual factors etc. act upon the group, groups do not function in isolation, personal characteristics of individuals influence the behaviour which is to some extent predictable.
Groups avoid the task at hand and emotional states hinder the task.
Bennis and Shepard saw the central issues of groups as a conflict between dependence and independence with power, love, authority and intimacy as the primary concern. These move the group from one phase to the next.