Context: The usability software quality characteristic aims to improve system user performance. In a previous study, we found evidence of the impact of a set of usability features 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 regarding 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 366 experimental subjects and apply aggregation (meta-analysis) procedures. Results: We find that the Abort Operation and Preferences usability mechanisms appear to improve system usability a great deal with respect to efficiency, effectiveness and user satisfaction. Conclusions: We find that the family of experiments further corroborates the results of the baseline experiment. Most of the results are statistically significant, and, because of the large number of experimental subjects, the evidence that we gathered in the replications is sufficient to outweigh other experiments.

中文翻译：

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可用性机制的影响：一系列关于效率、效果和用户满意度的实验


背景：可用性软件质量特征旨在提高系统用户性能。在之前的一项研究中，我们从用户的角度发现了一组可用性功能对效率、有效性和满意度的影响的证据。然而，影响级别似乎取决于可用性功能，并根据它们如何提升用户性能来建议实施的优先级。目标：我们使用一系列三个实验来提高基线实验结果的精度和概括性，并提供有关中止操作、进度反馈和首选项可用性机制对用户性能影响的发现。方法：我们在学术环境中对基线实验进行了两次重复。我们分析了 366 名实验对象的数据并应用聚合（荟萃分析）程序。结果：我们发现中止操作和首选项可用性机制似乎在效率、有效性和用户满意度方面极大地提高了系统可用性。结论：我们发现这一系列实验进一步证实了基线实验的结果。大多数结果具有统计显着性，并且由于实验对象数量众多，我们在重复中收集的证据足以胜过其他实验。