Impact of Usability Mechanisms: A Family of Experiments on Efficiency, Effectiveness and User Satisfaction
Juan M. Ferreira, Francy Rodr\'iguez, Adri\'an Santos, Silvia T., Acu\~na, Natalia Juristo

TL;DR
This study investigates how specific usability features like Abort Operation, Progress Feedback, and Preferences affect user performance, confirming their positive impact on efficiency, effectiveness, and satisfaction through multiple experiments.
Contribution
It provides a rigorous family of experiments that validate the significant positive effects of certain usability mechanisms on user performance.
Findings
Abort Operation and Preferences mechanisms improve usability
Most results are statistically significant
Replications strengthen baseline findings
Abstract
Context: The usability software quality attribute aims to improve system user performance. In a previous study, we found evidence of the impact of a set of usability characteristics from the viewpoint of users in terms of efficiency, effectiveness and satisfaction. However, the impact level appears to depend on the usability feature and suggest priorities with respect to their implementation depending on how they promote user performance. Objectives: We use a family of three experiments to increase the precision and generalization of the results in the baseline experiment and provide findings on the impact on user performance of the Abort Operation, Progress Feedback and Preferences usability mechanisms. Method: We conduct two replications of the baseline experiment in academic settings. We analyse the data of 367 experimental subjects and apply aggregation (meta-analysis) procedures.…
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