models

data models
continuous
field: differentiate, rotate
discrete
relations: predicate calculus, relational algebra
determine methods of analysis in computer
infovis uses both

mental models
how people think about problems, world
in your head, vs. data models in computer
not as flexible: we're hardwired for strong preferences
space vs. time: 2D+T != 3D
categorization as major cognition component
creating hierarchies to support reasoning

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