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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.

Support for this project was provided by the Association for Computing Machinery’s Special Interest Group in Data Communication (ACM SIGCOMM); the IBM Corporation; and the Vadasz Family Foundation, a contributor to the Computer Science and Telecommunications Board’s program on information technology and society. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations that provided support for the project.

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