TaskZ — “Keystroke level modeling (Card, Moran & Newell, 1983) is one of a variety of cognitive modeling techniques that have been reported in the literature over the last two decades. Cognitive modeling, simply put, involves identifying and counting all the discrete human operations – physical (e.g., mouse click, keystroke), cognitive (e.g., read or speak a syllable of text, make a mental comparison) and perceptual (e.g. locate something on screen) – that a user must execute in order to most efficiently accomplish a specific task on a specific user interface design.”

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