Usability is increasingly recognized as an important quality factor for interactive software systems, including traditional GUIs-style applications, Web sites, and the large variety of mobile and PDA interactive services. Unusable user interfaces are probably the single largest reasons why encompassing interactive systems – computers plus people, fail in actual use. The design of this diversity of applications so that they actually achieve their intended purposes in term of ease of use is not an easy task. Although there are many individual methods for evaluating usability; they are not well integrated into a single conceptual framework that facilitate their usage by developers who are not trained in the filed of HCI. This is true in part because there are now several different standards (e.g., ISO 9241, ISO/IEC 9126, IEEE Std.610.12) or conceptual models (e.g., Metrics for Usability Standards in Computing [MUSiC]) for usability, and not all of these standards or models describe the same operational definitions and measures. This paper first reviews existing usability standards and models while highlighted the limitations and complementarities of the various standards. It then explains how these various models can be unified into a single consolidated, hierarchical model of usability measurement. This consolidated model is called Quality in Use Integrated Measurement (QUIM). Included in the QUIM model are 10 factors each of which corresponds to a specific facet of usability that is identified in an existing standard or model. These 10 factors are decomposed into a total of 26 sub-factors or measurable criteria that are furtherdecomposed into 127 specific metrics. The paper explains also how a consolidated model, such as QUIM, can help in developing a usability measurement theory.
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Ahmed Seffah interests are at the intersection of human-computer interaction and software engineering, with an emphasis on human-centered software engineering, empirical studies, theoretical models for quality in use measurement, as well as patterns as a vehicle for capturing and incorporating empirically valid design practices in software engineering practices. He is a co-founder of the Usability and Empirical Studies Lab and the founder and the chair of the Human-Centered Software Engineering Research Group at Concordia University.
Harkirat K. Padda is a Ph.D. candidate at Concordia University (Montreal) since 2003, where she completed her masters’ degree in computer science. Her research interests are software quality measurement, metrics, and empirical software evaluation. Being a member of Human Computer Software Engineering Group, she is exploring the comprehension and usability of software systems—in particular the visualization systems. In her masters’ work, she already defined a repository of different metrics to measure the ‘quality in use’ factors of software products in general. Currently, she is proposing a pattern-oriented measurement framework to measure comprehension of visualization systems.
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Seffah, A., Donyaee, M., Kline, R.B. et al. Usability measurement and metrics: A consolidated model. Software Qual J 14, 159–178 (2006). https://doi.org/10.1007/s11219-006-7600-8
- User satisfaction
- Software engineering quality models