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'''KLM''' (or KLM-GOMS) stands for '''Keystroke-Level Model''', a hard science approach to [[human-computer interaction|human–computer interaction]] (HCI), based on CMN-[[GOMS]], developed by Card, Moran & Newell, and spelled out in their book ''The Psychology of Human Computer Interaction'', 1983. The Keystroke-Level Model is a 11 step method that can be used by individuals or companies seeking ways to estimate the time it takes to complete simple data input tasks using a computer and mouse. By using KLM-GOMS individuals often find more efficient or better ways to complete a task simply by analyzing the steps required in the process and rearranging or eliminating unneeded steps.
It is designed to be easier to use than other [[GOMS]] methods, such that companies who cannot afford human–computer interaction specialists can use it. KLM-GOMS is usually applied in situations that require minimal amounts of work and interaction with a computer interface or software design. The calculations and the number of steps required to accurately compute the overall task time increase quickly as the number of tasks involved increases. Thus, KLM-GOMS is best suited to evaluate and time specific tasks that require, on average, less than 5 minutes to complete.
==How does it work==
The KLM-GOMS model is designed to be as straightforward as possible. The sequence of operations is modeled as a sequence of a small number of operations. Each operation is assigned a duration, which is intended to model the average amount of time an experienced user would take to perform it.
===Step Terminology===
Kieras (1993, 2001) defines the following operations:
* '''K''', key press and release (keyboard)
Poor Typist (40 wpm) --- 0.28 seconds
Average Skilled Typist (55 wpm) --- 0.20 seconds
Average Non-secretary Typist (40 wpm) --- 0.28 seconds
Typing Random Letters --- 0.50 seconds
Typing Complex Codes --- 0.75 seconds
Worst Typist (unfamiliar with keyboard) --- 1.20 seconds
* '''P''', point the mouse to something - 1.1 sec
* '''B''', button press or release (mouse) - 0.1 sec
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