Here, the statistical model (regression) links the time it takes for a user toelicit a response to the design of the task environment (distance and width of buttons).

The theory starts with a high-level statement: The motorsystem is a limited-capacity channel. From there, it derives propositions about the relationshipbetween performance and interface design through the construct of a target.

“Attempts at reaching a target are limited by the speed and variance (accuracy) of themovement involved.”

“Human motor system is a limited capacity information channel.”