Psychologists, mostly from Canada and the US, demonstrate how a mature social psychological study of social categories can help clarify similarities and differences between different categorical systems, the way multiple social categories intersect and overlap, and how they can inform everyday interactions and public policy. They emphasize the similarities and differences between the category systems of gender and immigration, showing how a social psychology perspective can be applied to both. Annotation ©2012 Book News, Inc., Portland, OR (booknews.com)