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The [http://www.cs.cmu.edu/~bej/cogtool/ CogTool] project has developed an open-source tool to support KLM-GOMS analysis.
==How does it work==
The KLM-GOMS model is designed to be as straight as possible. The user is supposed to be the most experienced in order to see the minimal time required for a specific task.
The sequence of operations is minimized to a default set with a specific (medium) time associated to each one.
Kieras (1993) defines the following operations:
* '''K''', key press and release (keyboard) - 0.28 sec
* '''P''', point the mouse to something - 1.1 sec
* '''B''', button press or release (mouse) - 0.1 sec
* '''H''', hands movement from mouse to keyboard or reverse - 0.4 sec
* '''M''', mental thinking - 1.2 sec
* '''W(t)''', wait time (system) - t msec
Note that a mouse click is '''BB''' while a sequence of keys is '''KKK...''' or '''T(n)''' (T stands for 'type').
For example a common operation that involves pointing and clicking something on the screen is expressed as: MPBB (think, point, press, release).
This test can't be taken obviously as the only one to do to evaluate an interface, but it's useful as a complement and to compare two different interfaces designed to perform the same task.
==External links==
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