44. For more on social identity theory and self-categorization theory, see H. Tajfel. (1978). “Social categorization, social identity, and social comparison.” In H. Tajfel (ed.). Differentiation Between Social Groups in the Social Psychology of Intergroup Relations. p. 61–76. London: Academic Press; J. Turner. (1985). “Social categorization and the self-concept: A social cognitive theory of group behavior.” In E. J. Lawler (ed.). Advances in Group Processes: Theory and Research. p. 77–122. Greenwich, CT: JAI Press. For a recent empirical study applying these theories to better understand the impact of diversity on work groups, see J. Polzer, L. Milton, and W. Swann, Jr. (2002). “Capitalizing on diversity: Interpersonal congruence in small work groups,” Administrative Science Quarterly. 47(2): p. 296–324.