This is the author's final draft of the paper published as: Encyclopedia of the Life Course and Human Development / Deborah Carr (ed. in chief), Robert Crosnoe, Mary Elizabeth Hughes, Amy M. Pienta (eds.), Vol. 2, pp. 255-256. The final version is available from http://www.gale.cengage.com/servlet/ItemDetailServlet?region=9&imprint=000&titleCode=M363&cf=p&type=4&id=242719From Deborah Carr, ed., et al. Encyclopedia of the Life Course and Human Development © 2008 Gale, a part of Cengage Learning, Inc. Reproduced by permission. www.cengage.com/permission
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