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"Harold Kelley’s long-term relationship with John Thibaut, from 1953 until Thibaut’s demise in 1986, is considered an exemplary model of scientific collaboration. It began with their being invited to write a major chapter on group problem-solving and process for the Handbook of Social Psychology (1954). That chapter, updated in 1968, not only became a major resource in that field, but it led them to a separate volume, The Social Psychology of Groups (1959), which became one of the most influential works in social psychology."
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Bertram Raven