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In this paper we present a method, the Cost-of-Knowledge Characteristic Function, for characterizing information access from dynamic displays. The paper works out this method for a simple, but important, class of dynamic displays called direct-walk interactive information visuatizations, in which information is accessed through a sequence of mouse selections and key selections. The method is used to characterize a simple calendar task for an application of the Information Visualizer, to computedoi:10.1145/259963.260366 dblp:conf/chi/CardPM94 fatcat:m7wbry4bnzellllsryexli7wr4