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.

Support for this project was provided by core funds of the Computer Science and Telecommunications Board. Core support for the CSTB is provided by its public and private sponsors: the Air Force Office of Scientific Research, Defense Advanced Research Projects Agency, Department of Energy, National Aeronautics and Space Administration, National Institute of Standards and Technology, National Library of Medicine, National Science Foundation, Office of Naval Research, AT&T, Hewlett-Packard, Intel, Microsoft, and Time-Warner Cable.

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