How do you select the most useful and appropriate usability measures? If the purpose of the test is to decide whether a product has adequate usability (the type of test the CIF is intended for), measures should focus on the end result (as defined in ISO 9241-11): Effectiveness: "accuracy and completeness." Error-free completion of tasks is important in both business and consumer applications. Efficiency: "resources expended." How quickly a user can perform work is critical for business productivity. Satisfaction: "positive attitudes toward the use of the product." Satisfaction is a success factor for any products with discretionary use; it's…
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