Synchronized punch-card displays are an interface technique to visualize tens of thousands of variables by encoding their values as color chips in a rectangular array. Our technique ties multiple such displays to a timeline of events enabling the punch-card displays to show animations of the behavior of complex systems. Punch-card displays not only make it easy to understand the highlevel behavior of systems, but also enable users to quickly focus on individual variables and on fine-grained time intervals. This paper describes synchronized punch-card displays and shows how this technique is extremely powerful for understanding the behavior of complex multi-agent systems.
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