@article{GockelKerrSeoketal.2008, author = {Gockel, Christine and Kerr, Norbert L. and Seok, Dong-Heon and Harris, David W.}, title = {Indispensability and group identification as sources of task motivation}, series = {Journal of Experimental Social Psychology}, volume = {44}, journal = {Journal of Experimental Social Psychology}, number = {5}, pages = {1316 -- 1321}, year = {2008}, abstract = {Traditional Instrumentality × Value (I × V) models have attributed gains in performance groups to various conditions affecting the instrumentality of group members' effort for a variety of valued outcomes. Social identity models have challenged this interpretation, suggesting that the instrumentality of effort may be irrelevant when group identification is high. A laboratory study is reported in which both indispensability and group identification are manipulated, and participants' effort on a physical persistence task is assessed. Contrary to the social identity predictions but consistent with I × V predictions, the indispensability of effort had a positive effect on participants' effort. Group identification had no direct or moderating effects on effort.}, language = {en} }