NATIONAL ACADEMY PRESS
2101 Constitution Avenue, N.W. Washington, D.C. 20418
NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.
This report has been reviewed by a group other than the authors according to procedures approved by a Report Review Committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.
International Standard Book Number: 0-309-08298-6
Limited copies are available from:
Board on Science, Technology, and Economic Policy
National Research Council
1055 Thomas Jefferson Street, N.W.
Washington, D.C. 20007
Additional copies are available for sale from:
National Academy Press
Box 285 2101 Constitution Ave., N.W. Washington, D.C. 20055 800-624-6242 202-334-3313 (in the Washington Metropolitan Area) Internet: http://www.nap.edu
Copyright 2002 by the National Academy of Sciences. All rights reserved.
Printed in the United States of America