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    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 competencies and with regard for appropriate balance.

    This study was funded by the U.S. Department of Housing and Urban Development, Contract Number C-OPC-21756. All opinions, findings, conclusions, and recommendations expressed herein are those of the National Research Council and do not necessarily reflect the views of the Department of Housing and Urban Development.

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    Copyright 2000 by the National Academy of Sciences. All rights reserved.

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