Graphs are a very common form of representing information. The author proposes a theory that identifies pre-attentive tasks ( tasks performed by the user without much attention) in extracting information from graphs and understand the nature of such tasks. The elementary tasks in understanding bar charts, pie charts etc are explained.These elementary tasks are then ordered based on accuracy.
The theory is then tested by redesigning several commonly used graphs using the perceptual tasks so that the user can interpret the quantitative information accurately. There are several mathematical formulas listed in this paper which are hard to understand without prior knowledge of the domain.Thus a naive reader cannot comprehend a lot of information that the author presents.
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