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1. The predictions of GOMS models have been tested and retested and the predictions have been found to be valid. Designers can use GOMS with confidence that it will produce valid predictions
2. GOMS has been shown to be capable of finding usability problems that are not found through normal development or other forms of analysis.
The goals and methods require the analyst to think about the structure of the task as the user sees it thereby uncovering inconsistencies
3. helps find ways of reducing execution time and thereby save money
4. Constructing such a model requires a small percentage of total development time. This saves development time by uncovering inconsistencies and flaws in the design and saves the users time by reducing the learning time required to manipulate the system.