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Equilibrium model of group development
The equilibrium model of group development (equilibrium model) was created by Robert Bales, a pioneer of the empirical studies on group development.〔Hare, A. P. (1967). Handbook of small group research. New York: The Free Press.〕 The equilibrium model posits that members within a group struggle to maintain a balance between task-oriented (instrumental) and socio-emotional (expressive) needs.〔Bales, R. F. (1950). Interaction process analysis. Cambridge, MA: Addison-Wesley.〕〔Bales, R. F. (1970). Personality and interpersonal behavior. New York: Holt Rinehart & Winston.〕〔Bales, R. F., & Strodbeck, F. L. (1951). Phases in group problem solving. Journal of Abnormal and Social Psychology, 46, 458-495. doi:10.1037/h0059886〕 The equilibrium model was the first extensive and systematic description of group development borne out of group observation.〔Mennecke, B. E., Hoffer, J. A., & Wynne, B. E. (1992). The implications of group development and history for group support system theory and practice. Small Group Research, 23, 524-572. doi:10.1177/1046496492234005〕 The equilibrium model is classified as a progressive model as it explains group maturity and performance over a given period of time.〔 Bales’ equilibrium model was proposed as a means to study the manifestation and incidence of task-oriented and socio-emotional behaviours within groups.〔Carabajal, K., LaPointe, D., Gunawardena, C. N. (2003). Group development in online learning communities. In M. G. Moore & W. G. Anderson (Ed.), Handbook of distance education (pp. 217-234). Mahwah, NJ: Lawrence Erlbaum Associates.〕
== Stages ==
There are three main progressive stages within the equilibrium model.〔Chidambaram, L. & Bostrom, R. P. (1996). Group development (I): A review and synthesis of development models. Group Decision and Negotiation, 6, 159-187.〕 The first stage is the orientation stage which refers to the initial instance where the group members meet. In this exploratory stage, members ask questions and exchange information with one another, and task-oriented behaviours are prevalent. The second phase of the equilibrium model is the evaluation stage and refers to when group members express their opinions and attitudes. In the evaluation stage, socio-emotional behaviours increase among the group members. The third phase of the equilibrium model is the control stage. Within the control stage, group members exert pressure in order to influence group actions and activities. Overall, as a group moves throughout the three progressive stages, task-oriented behaviours decline while socio-emotional behaviours increase〔
Successful group performance and cohesiveness is achieved once a group has matured and the members are able to maintain equilibrium between how well they can solve the task or problem facing the group (task-oriented behaviours) with how well they deal with interpersonal relationships and member satisfaction (socio-emotional behaviours). However, equilibrium may be temporary; for example, as the group encounters a new situation or takes on new members, the group may need to move through the three progressive stages once again.〔
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