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The aim of this paper is twofold (i) comparing the effectiveness of two evaluation methods, namely heuristic evaluation and usability testing, as applied to an experimental version of the UNIVERSAL Brokerage Platform (UBP), and (ii) inferring implications from the empirical findings of the usability test. Eight claims derived from previous research works(More)
Effectiveness of Heuristic Evaluation (HE) has severely been challenged. The present study investigated two strategies for improving the effectiveness of HE: Selection of usability guidelines (Gerhardt-Powals' cognitive engineering principles vs. Nielsen's heuristics); Provision of support and training. We also examined various strategies for estimating the(More)
User effect in terms of influencing the validity and reliability of results derived from standard usability tests has been studied with different approaches during the last decade, but inconsistent findings were obtained. User effect is further complicated by other confounding variables. With the use of various computational models, we analyze the extent of(More)
Research on heuristic evaluation in recent years has focused on improving its effectiveness and efficiency with respect to user testing. The aim of this paper is to refine a research agenda for comparing and contrasting evaluation methods. To reach this goal, a framework is presented to evaluate the effectiveness of different types of support for structured(More)
Defect classification can improve product quality and motivate process improvement. Several defect classification schemes have been developed and used with good results in software development. This paper describes the design and test of a defect classification scheme that specifically extracts information from usability problems. We describe the attributes(More)
Identifying accurate user requirements early in the design cycle is of the utmost importance in system development. The purpose of this study of requirements elicitation was to compare the results of involving the user early in the design cycle using a low-fidelity prototype with the results of involving the user after a high-fidelity prototype was(More)
The process of consolidating usability problems (UPs) is an integral part of usability evaluation involving multiple users/analysts. However, little is known about the mechanism of this process and its effects on evaluation outcomes, which presumably influence how developers redesign the system of interest. We conducted an exploratory research study with(More)
Existing defect classification schemes are mainly used to characterize software defects. A few of them are specifically applicable to usability problems, but they have not been validated and their reliability has been assessed in a limited way. The aim of this study is to evaluate comprehensively the Classification Usability Problems (CUP) scheme. First,(More)