
810 CHAPTER 26. SOCIAL NETWORKS
Design Visualization design is the specification of a mapping from an information
space to its graphical representation. The core choices are in assigning graphical
elements such as points, lines, and areas to data objects, and in defining their
graphical attributes such as position, shape, size, color, and so on such that the
information is perceived correctly (effectiveness) and with low cognitive effort
(efficiency).
Many overlapping and contradicting criteria need to be considered. In particu-
lar, Tufte advocates general information design criteria such as parsimony and
accuracy [Tuf83, p. 51]. An important readabilit