levels of creativity are achieved, and the group's productivity soars. If new individuals are introduced into the membership at this point, they will be viewed as outsiders or intruders, and the group will have to evolve again, much as it did initially. Esprit stage Esprit de corps: a golden rule by Henri Fayol is closely associated with this stage of Cog's, which says that nothing has higher pinnacles to reach than spirit of corps. Mutual acceptance with high cohesiveness and a general feeling of esprit. Charrier states that the planning team can do its finest work and be most productive in this final stage in the model. It is also noted that this stage will not always be achieved; however, for this level of cooperation, as well as productivity, the other four stages must be met. Comparisons Cog's ladder is very similar to Tuckman's stages, another stage model of groups, which lacks the "Why We're Here" stage, and calls the remaining four stages "Forming", "Storming", "Norming", and "Performing". There are also other similar models, some of which are cyclic rather than reaching an end state. References External links – An article discussing Cog's ladder - Guide to implementing Cog's ladder in your group Charrier, G. O. (1972). Cog's ladder: A model of group growth. SAM Advanced Management Journal (00360805), 37(1), 30. - Cog's Ladder Greenberg, J. (2011) Behavior in organizations (10th ed.). New York, NY: Prentice Hall Publishers. - Tuckman's Model 1972 introductions Behavioural sciences Economic efficiency Group processes Management systems Social groups