This article is based on a doctoral dissertation submitted to the Graduate School of the University of Texas at Austin. The author is grateful to Arnold Buss, dissertation chairman, for his guidance, enthusiasm, and support throughout graduate school. The same is true for Robert Wicklund. Appreciation is also conveyed to David Class, Devendra Singh, and Clarke Burnham for serving as committee members. Finally, the author would like to thank Arnold Buss, Eva Scheier, and Richard Schulz for their assistance in the preparation of this manuscript.