Abstract
`Differences are the raison dW'tre of human beings' (Henri Lopes, African author, interviewed in Information, 22, February 1991). This paper argues that `diversity' can function as a third object in dissolving an overcohesive matrix symbolizing the mother-child dyad and sets out a triangular, oedipal model to develop the thesis of diversity as a group-specific factor. The concepts of group cohesion and coherency are discussed in terms of their respective therapeutic and countertherapeutic possibilities.

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