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	KLM-GOMS	Cognitive Walkthrough
Campo	Interazione uomo-macchina	Interazione uomo-macchina
Famiglia	Hypothesis test	Hypothesis test
Anno di origine	1983	1990
Ideatore	Stuart Card, Thomas Moran, Allen Newell	Clayton Lewis, Peter Polson, Cathleen Wharton, John Rieman
Tipo	Computational cognitive model for task execution time prediction	Evaluative walkthrough examining how users learn to use an interface
Fonte seminale	Card, S. K., Moran, T. P., & Newell, A. (1983). The Psychology of Human-Computer Interaction. Lawrence Erlbaum Associates. ISBN: 0898592437	Lewis, C., Polson, P. G., Wharton, C., & Rieman, J. (1990). Testing a walkthrough methodology for specifying and evaluating user interface designs. In Proceedings of the SIGCHI Conference on Human Factors in Computing Systems (pp. 387–392).
Alias	GOMS Model, KLM	Cognitive Walkthrough, CW Analysis
Correlati	4	4
Sintesi	The Keystroke-Level Model (KLM), part of the Goals-Operators-Methods-Selection rules (GOMS) framework, is a computational method for predicting how long a user will take to accomplish a routine task using an interactive system. Developed by Card, Moran, and Newell in 1983, KLM decomposes user actions into primitive operators (keystrokes, mouse clicks, mental preparation, system response waits) with empirically derived execution times, enabling designers to estimate task performance without running user studies.	Cognitive Walkthrough is an inspection method for evaluating interface designs by simulating and analyzing how users will learn to use a system through exploration and trial. Developed by Clayton Lewis, Peter Polson, Cathleen Wharton, and John Rieman in 1990, this method is grounded in cognitive psychology and focuses specifically on learnability—whether first-time or occasional users can discover how to perform tasks without formal training. Evaluators role-play user actions, answer a set of critical questions about feedback and discovery at each step, and document usability problems.