The relevance tree shown here for health services and materials is not comprehensive, but illustrates the use of the technique for relating national or other broad goals to pertinent needs in research. Additional pathways between basic research and broad goals have been omitted for the sake of simplicity. Also omitted is the time scale: research on materials, for example, might not begin feeding information upward for 10 years or more.
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National Concerns and Technical Challenges ."
Materials and Man's Needs: Materials Science and Engineering . Washington, DC: The National Academies Press,
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