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The authors investigate team identification and individual differentiation as complementary drivers of team members'citizenship and creative behavior. As hypothesized, the results of a survey among 157 middle-management team members show team identification to be positively related to citizenship behavior toward other team members, whereas individual differentiation is positively associated with creative behavior. Moreover, citizenship behavior is found to be a mediator that linked team identification to an individual's effectiveness as a team member, whereas creative behavior is the mediating link in the relationship between individual differentiation and individual effectiveness. Theoretical implications and suggestions for practitioners are discussed.