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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.

Program and staff costs for this study came from the U.S. Agency for International Development, specifically USAID’s Bureau for Africa with additional support from the Office of U.S. Foreign Disaster Assistance. Additional funding was received from the Presidents Committee of the National Academies. 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-10 0-309-10333-9 (Book)

International Standard Book Number-13 978-0-309-10333-6 (Book)

International Stardard Book Number-10 0-309-66582-5 (PDF)

International Standard Book Number-13 978-0-309-66582-7 (PDF)

Library of Congress Catalog Card Number 93-86876

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