Keystroke-level model: Difference between revisions

Revision as of 04:28, 1 April 2008

Revision as of 06:10, 2 April 2008

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* '''H''', Hand from keyboard to mouse or vice versa --- 0.40 seconds

* '''M''', Mental Preparation --- 1.20 seconds

* '''WT(t)''', waitResponse time (by system) - t msec

*'''D(n0,l0)''', Draw n0 straight line segment with mouse of total length l0 centimeters

A mouse click would be written "BB" (button press, button release) while a sequence of 3 keyboard key presses is "KKK..." or "T(n)" ("T" stands for "type").

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'''Steps'''

*Mentally prepare

*6 average speed keystrokes (for word "change")

*1 average speed keystrokes for space bar

*3 keystrokes for pressing numbers "512"

*1 average speed keystrokes for space bar

*Mentally Prepare by reading what needs to be changed

*6 average keystrokes for typing hte and the

6

*3 keystrokes to press the 3 " ' "

*1 keystroke to press Return Key

===Values===

K1 = average speed keystrokes (0.20 seconds)

K2 = typing random letters (0.50 seconds)

M = Mentally Prepare (1.35 seconds)

Put above steps into formula: M + 6K1 + K1 + 3K2 + K1 + M + K2 + 3K1 + K2 + 3K1 + K2 = 2M + 14K1 + 6K2 = 9.82 seconds

==Problems with this model==