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group leader leadership study van knippenberg research effect knippenberg diversity performance behavior psychology member information follower journal process identity participant relationship organization condition prototypicality theory group members identi decision fairness analysis management leadership effectiveness interaction result leader group prototypicality model fication identi fication effectiveness perspective identification people perception difference personality elaboration level measure transformational leadership review hypothesis manipulation university creativity influence outcome representation transformational trust fi ndings focus task representations power belief exchange employee motivation orientation contribution cremer fluence press erasmu categorization leadership e ffectiveness information elaboration affective vision e ffects context extent