Hayes, William Leaf, and especially Jola A. Jakimik. Bibliographic assistance
came from Elaine Shelton, and Marlene Naughton did the lioness' share of the
secretarial work for both the Symposium and the book itself. Symposium
planning, execution, and follow-up were masterfully managed by Marcia Gold-
stein, assisted by Marshall Atlas, Michelene Chi, and Kenneth Kotovsky. I would
like to thank all of these people for assisting a neophyte editor and symposium
organizer. I would also like to acknowledge the constructive approach to
contract supervision that was evidenced by Dr. Joseph L. Young, Assistant
Director of the Personnel and Training Research Programs, Office of Naval
Research. He played a key role in the initial conception of the Symposium topic
and provided unobtrusive encouragement throughout the whole enterprise.

Finally, I gladly thank my wife Pat for her advice, encouragement, and
wisdom, and for the assumption of responsibilities that this book at times caused
me to neglect.

DAVID KLAHR
Pittsburgh, Pennsylvania

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