Robert A. Amar and John T. Stasko.
  <b>Knowledge Precepts for Design and Evaluation of Information
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  <i>IEEE Transactions on Visualization and Computer Graphics</i>,
  11(4):432-442, July/August 2005.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Amar-2005-KPD.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Amar-2005-KPD.bib">(bibtex:
  Amar-2005-KPD)</A>.<br />