The advent of mobile applications has brought new frontiers to usability studies. So far, the ongoing research has undertaken considerable efforts to model usability in such new challenging context. One of these endeavors is the PACMAD+3 model, which consists of a total of ten unique factors. However, to the best of our knowledge, little or no effort has been made to empirically evaluate these factors against perceived influence. With this in mind, the objective of this study is to explore this issue by evaluating the selected factors. To achieve this goal in a reliable and reproducible manner, we took advantage of previous attempts to conceptualize the mobile usability factors, but we contribute by operationalizing these theoretical constructs into observable and measurable phenomena. In this sense, the survey was designed and carried out on the sample of 838 users in order to evaluate the significance of the PACMAD+3 factors on the perceived usability of mobile applications. Our findings show that, on average, users rated efficiency as highly important, while the remaining seven, namely: cognitive load, errors, learnability, operability, effectiveness, memorability, and understandability, were rated as moderately important. The discussed results provide insight into the importance of usability attributes and quality criteria from both perspectives, ultimately facilitating and securing the design and development of mobile applications. Therefore, our research contributes to the field of human-computer interaction, with both theoretical and practical implications for mobile usability researchers, UX designers, and quality assurance engineers.

翻译：移动应用的出现为可用性研究带来了新的前沿领域。迄今为止，已有研究在这一充满挑战的新背景下为可用性建模付出了相当大的努力。其中一项成果是PACMAD+3模型，该模型共包含十个独特因素。然而，据我们所知，目前几乎没有研究对这些因素与感知影响之间的关系进行实证评估。鉴于此，本研究的目标是通过评估选定因素来探讨这一问题。为了以可靠且可复现的方式实现这一目标，我们借鉴了先前将移动可用性因素概念化的尝试，并通过将这些理论构念操作化为可观测和可测量的现象做出了贡献。为此，我们设计并实施了一项针对838名用户的调查，以评估PACMAD+3因素对移动应用感知可用性的影响显著性。研究结果表明，用户平均将效率评为高度重要因素，而其余七个因素——认知负荷、错误、可学习性、可操作性、有效性、可记忆性和可理解性——则被评为中等重要因素。所讨论的结果从不同视角揭示了可用性属性和质量准则的重要性，最终促进并保障了移动应用的设计与开发。因此，本研究对人机交互领域做出了贡献，对移动可用性研究者、用户体验设计师和质量保证工程师具有理论与实践的双重意义。