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The aim of this study is to show that, when examining social identification, it is both possible and important to distinguish between self-categorisation, commitment to the group, and group self-esteem, as related but separate aspects of group members' social identity. This was demonstrated in an experiment (N= 119), in which Ingroup Status (high/low), Ingroup Size (majority/minority), and Group Formation (self-selected/assigned group membership) were manipulated orthogonally. The results of this study confirm that these three aspects of social identity can be distinguished as separate factors in a principal components analysis. Furthermore, as predicted, the three aspects are differentially related to manipulated group features, as well as displays of ingroup favouritism. Group members' self-categorisations were only affected by the relative size of the group, while group self-esteem was only influenced by group …