Table 16.1 Initial Model Operators with Time Values
K Single keystroke (average 0.20
skilled typist, 0.20 second
= 55 words/min)
Single mouse click (finger 0.12
down, finger up)
Point with mouse (hand 1.10
already on mouse, move
mouse to move pointer
across screen to a given
target)
H "Home"remove hand from 0.40
one input device (e.g.,
keyboard) to another
(e.g., mouse)
M Mental operatormused only 1.35
to capture time taken to
move eyes across windows
W1Existing A system response time 0.25
("Wait") for, e.g., field or
window to take focus in
response to mouse click
A system response time
("Wait") for, ...
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