Review Article
A Systematic Review of Modifications and Validation Methods for the Extension of the Keystroke-Level Model
Table 1
KLM operators and predicted execution times in seconds [
6].
| Type | Operator | Description | Time (s) |
| Physical | K | Keystroke or button press | | | Best typist (135 wpm) | 0.80 | | Good typist (90 wpm) | 0.12 | | Average skilled typist (55 wpm) | 0.20 | | Average non-skilled typist (40 wpm) | 0.28 | | Typing random letters | 0.50 | | Typing complex codes | 0.75 | | Worst typist | 1.20 | | P | Point with a mouse to a target on a display | 1.10 | | H | Home hands on the keyboard or other device | 0.40 | | D | Drawing n straight line segments with a total length of l | | Mental | M | Mental preparation for an action | 1.35 | System | R(t) | System response of seconds | |
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wpm: words per minute.
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