Visualization: The use of computer-supported, interactive, visual representations of data to amplify cognition. (6) Cognition is the acquisition or use of knowledge. This definition has the virtue of focusing as much on the purpose of visualization as the means. Hamming (1973) saud, “the purpose of computation is insight, not numbers. ” Likewise for visualization, “the purpose of visualization is insight not pictures. ” The main goals of this insight are discovery, decision making, and explanation. (6)