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Wavelength (talk | contribs) applying WP:MOS in regard to hyphenation: —> "one-minute" [1 instance]—WP:MOS#Numbers (point 1)—WP:HYPHEN, sub-subsection 3, points 3 and 8 |
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== Structure of the Keystroke-Level Model ==
The Keystroke-Level Model consists of six operators: the first four are physical motor operators followed by one mental operator and one system response operator:<ref>{{cite journal|last1=Card|first1=Stuart K|last2=Moran|first2=Thomas P|last3=Newell|first3=Allen|title=The keystroke-level model for user performance time with interactive systems|journal=Communications of the ACM|date=1980|volume=23|issue=7|pages=398–400|doi=10.1145/358886.358895|ref=5}}</ref>
* '''K''' (keystroke or button press): it is the most frequent operator and means keys and not characters (so e.g. pressing SHIFT is a separate K operation). The time for this operator depends on the motor skills of the user and is determined by one
* '''P''' (pointing to a target on a display with a mouse): this time differs depending on the distance to the target and the size of the target,<ref>{{cite journal|last1=Fitts|first1=Paul M|title=The information capacity of the human motor system in controlling the amplitude of movement|journal=Journal of Experimental Psychology: General|date=1992|volume=121|issue=3|doi=10.1037/h0055392|ref=3}}</ref> but is held constant. A mouse click is not contained and counts as a separate K operation.
* '''H''' (homing the hand(s) on the keyboard or other device): This includes movement between any two devices as well as the fine positioning of the hand.
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