Impact of usability mechanisms:an experiment on efficiency, effectiveness and user satisfaction
| Autor: | Natalia Juristo, Oscar Dieste, Juan M. Ferreira, Adrian Santos, Francy D. Rodríguez, Sira Vegas, Silvia T. Acuña |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Computer science
Usability Satisfaction Context (language use) Effectiveness 02 engineering and technology Efficiency USable Empirical research Human–computer interaction 0202 electrical engineering electronic engineering information engineering Software system Software engineering business.industry Abort 020207 software engineering Software quality Experimental design Computer Science Applications Empirical study Problem domain 020201 artificial intelligence & image processing Usability mechanism business Software Information Systems |
| Popis: | Context As a software quality characteristic, usability includes the attributes of efficiency, effectiveness and user satisfaction. There are several recommendations in the literature on how to build usable software systems, but there are not very many empirical studies that provide evidence about their impact. Objective We report an experiment carried out with users to understand the effect of three usability mechanisms —Abort Operation, Progress Feedback and Preferences— on efficiency, effectiveness and user satisfaction. Usability mechanisms are functionalities that should, according to the HCI community, be implemented within a software system to increase its usability. Method The experiment was conducted with 168 users divided into 24 experimental groups. Each group performs three online shopping tasks. We measure efficiency variables (number of clicks and time taken), effectiveness (percentage of task completion) and user satisfaction gathered from a questionnaire. Results The adoption of Abort Operation has a significantly positive effect on efficiency (time taken), effectiveness and user satisfaction. The adoption of Progress Feedback does not appear to have any impact on any of the variables. The adoption of Preferences has a significantly positive effect on effectiveness and user satisfaction but no influence on efficiency. Conclusions We provide relevant evidence of the impact of the three usability mechanisms on efficiency, effectiveness and user satisfaction. In no case do the usability mechanisms degrade user performance. The effort to adopt Abort Operation and Preferences appears to be justified by the benefits in terms of effectiveness and user satisfaction. Also Abort Operation enables the user to be more productive. We believe that the effects on efficiency, effectiveness and satisfaction depend not only on mechanism functionality but also on the problem domain. The impact of a mechanism in other contexts could differ. Therefore, we need to conduct further experiments to gather more evidence and confirm these results. |
| Databáze: | OpenAIRE |
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