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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.

This study was supported by: Contract/Grant No. NASW-99037, Task Order 103, between the National Academy of Sciences and the National Aeronautics and Space Administration; Contract/Grant No. OFED-13416 between the National Academy of Sciences and Sandia National Laboratories; Contract/Grant No. CMRC-50SBNB9C1080 between the National Academy of Sciences and the U.S. Department of Commerce; Grant No. NSF-EIA-0119063 between the National Academy of Sciences and the National Science Foundation; and Contract/Grant No. DOE-DE-FG02-01ER30315 between the National Academy of Sciences and the U.S. Department of Energy. Additional support was provided by Intel Corporation. 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.

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