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The National Academy of Engineering (NAE) was established in 1964, under the charter of the NAS, as a parallel organization of distinguished engineers. It is autonomous in its administration and in the selection of members, sharing with the NAS its responsibilities for advising the federal government. The National Academy of Engineering also sponsors engineering programs aimed at meeting national needs, encourages education and research, and recognizes the superior achievements of engineers. Dr. William A. Wulf is president of the NAE.

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Financial Support: The development of this guide was supported by the Robert Wood Johnson Foundation and the Burroughs-Wellcome Fund. Dissemination support for this guide was provided by the American Mathematical Society.

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Copyright 1997 by the National Academy of Sciences. All rights reserved. This document may be reproduced solely for educational purposes without the written permission of the National Academy of Sciences.

Cover illustration by Leigh Coriale.

Printed in the United States of America

First Printing, November 1997

Second Printing, March 1998



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