Chapter Four. Quantification

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	Human Interface, The: New Directions for Designing Interactive Systems By Jef Raskin
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The harmony of the world is made manifest in Form and Number, and the heart and soul and all the poetry of Natural Philosophy are embodied in the concept of mathematical beauty.

?span>D'Arcy Wentworth Thompson, On Growth and Form (1917)

A number of methods for analyzing interface details quantitatively are available. However, explicit directions on how to use them are rare. This chapter gives an easy-to-use treatment and fully worked-out examples of Card, Moran, and Newell's keystroke-level GOMS model, Raskin's measures of efficiency, Hick's Law, and Fitts' law.

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