Given that heuristic evaluation (HE) is a popular evaluation method among practitioners despite criticisms surrounding its performance and reliability, there is a need to improve the method's performance. Several studies have shown HE-Plus, an emerging variant of HE, to outperform HE in both effectiveness and reliability. HE-Plus uses the same set of… (More)
For more than a decade, the number of usability test participants has been a major theme of debate among usability practitioners and researchers keen to improve usability test performance. This paper provides evidence suggesting that the focus be shifted to task coverage instead. Our data analysis of nine commercial usability test teams participating in the… (More)
The lack of standard assessment criteria for reliably comparing usability evaluation methods (UEMs) is an important gap in HCI knowledge. Recently, metrics for assessing thoroughness, validity, and effectiveness of UEMs, based on user data, have been proposed to bridge this gap. This paper reports our findings of applying these proposed metrics in a study… (More)
This paper explores the theories and practices underpinning Virtual Immersion, a discount technique proposed to help designers gain deep understanding of, and empathise with, their users. Four essential elements to this technique are identified and empirical evidence for its usefulness is provided. A study is reported in which the technique was applied to… (More)
Studies comparing performance of Usability Evaluation Methods (UEMs) led to three standard metrics, namely, validity, thoroughness, and effectiveness, calculated from lab-based usability test results. The effectiveness metric, E = T x V, was proposed as the 'figure of merit'  that would give a balanced account of validity and thoroughness. This paper… (More)
<b>Motivation</b> -- To design ways of attracting users onto Internet sites, which are more persuasive than Banner advertisements, and which maintain the usability of the host site equally well. <b>Research approach</b> -- An initial example of a "Follow-on" 'advertisement' is developed in a demonstration domain and tested in a usability laboratory. The… (More)
How can we keep technology-focused computing and software engineering students interested and engaged in a soft subject like HCI? How can we avoid leaving the less gifted and less enthused students behind in a 12-week module packed with theories, methodologies and with a new development tool to learn? This paper describes how educational research findings… (More)
This poster describes research which resulted in a checklist and design principles for diagrammatic visual programming languages (VPLs) based on empirical data collected through a series of controlled experiments and a qualitative-naturalistic inquiry.