Usability comprises the aspects effectiveness, efficiency, and satisfaction. The correlations between these are not well understood for complex tasks. We present data from an experiment where 87 subjects solved 20 information retrieval tasks concerning programming problems. correlation as indicated by task completion time, quality of solution, was negligible. Generally, among usability depend in a way on application domain, user's experience, use context. Going through three years CHI...

Abstract Computer professionals have a need for robust, easy-to-use usability evaluation methods (UEMs) to help them systematically improve the of computer artifacts. However, cognitive walkthrough (CW), heuristic (HE), and thinking- aloud study (TA)-3 most widely used UEMs-suffer from substantial evaluator effect in that multiple evaluators evaluating same interface with UEM detect markedly different sets problems. A review 11 studies these 3 UEMs reveals exists both novice experienced...

Understanding the mechanisms that shape adoption and use of information technology is central to human--computer interaction. Two accounts are particularly vocal about these mechanisms, namely acceptance model (TAM) work on user experience (UX) models. In this study, we review 37 papers in overlap between TAM UX models explore experiential component interactions. The provide rich insights what constructs influence interactions how related. For example, effect perceived enjoyment attitude...

Journal Article Trust in information sources: seeking from people, documents, and virtual agents Get access Morten Hertzum, Hertzum ∗ Centre for Human–Machine Interaction, Risø National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark ∗Corresponding author. Tel.: +45-4677-5145; fax: +45-4677-5199 Search other works by this author on: Oxford Academic Google Scholar Hans H.K Andersen, Andersen Verner Camilla B Hansen Interacting with Computers, Volume 14, Issue 5, October 2002, Pages...

Abstract Thinking aloud is widely used for usability evaluation. The validity of the method is, however, debatable because it generally in a relaxed way that conflicts with prescriptions classic model obtaining valid verbalisations thought processes. This study investigates whether participants think or behave differently compared to performing silence. Results indicate whereas thinking has little no effect on behaviour apart from prolonging tasks, affects multiple ways. During took longer...

Abstract The term usability is ubiquitous in human–computer interaction, so much that it commonly used without definition. Rather than one established meaning of usability, there are, however, multiple images usability. Although each image provides a partial view, the partiality remains implicit unless confronted with alternative images. This study delineates six usability: universal situational perceived hedonic organizational and cultural different foci provide opportunities for becoming...

We discuss the impact of cultural differences on usability evaluations that are based thinking-aloud method (TA). The term 'cultural differences' helps distinguish in perception and thinking Westerners (people from Western Europe US citizens with European origins) Easterners China countries heavily influenced by its culture). illustrate cognition four central elements TA: (1) instructions tasks, (2) user's verbalizations, (3) evaluator's reading user, (4) overall relationship between user...

When computers unexpectedly delay or thwart goal attainment, frustration ensues. The central studies of the extent, content, and impact such were done more than 15 years ago. We revisit this issue after have become mature computer use is extensive. To end, we had 234 crowdsourced participants log frustrating episodes they experienced with their during one hour use. average time lost due to was between 11% 20% one-hour period. Though less in earlier studies, remains a common user experience....

Computer professionals have a need for robust, easy-to-use usability evaluation methods (UEMs) to help them systematically improve the of computer artifacts. However, cognitive walkthrough (CW), heuristic (HE), and thinking- aloud study (TA)-3 most widely used UEMs-suffer from substantial evaluator effect in that multiple evaluators evaluating same interface with UEM detect markedly different sets problems. A review 11 studies these 3 UEMs reveals exists both novice experienced evaluators,...

Effects of age on pointing performance have become increasingly important as computers extensively used by still larger parts the population. This study empirically investigates young (12–14 years), adult (25–33 and elderly (61–69 years) participants' when with mouse touchpad. The goal is to provide an integrated analysis (a) how these three groups differ in performance, (b) differences are affected two devices, (c) submovement structure cursor trajectories may explain differences. Results...

July 01 2012 Sustained Participatory Design: Extending the Iterative Approach Jesper Simonsen, Simonsen Guest Editor for DesignIssues 28, no. 3 (Summer 2012), is Professor of Design Studies at Roskilde University. His research interests include Design, and offering theories methods IT design in an organizational context. Recent publications et al., eds., Research: Synergies from Interdisciplinary Perspectives (Routledge, 2010) Robertson, Routledge International Handbook 2012). Search other...

The value of thinking aloud in usability tests depends on the content users’ verbalizations. We investigated moderated and unmoderated verbalizations during relaxed (i.e., verbalization at Levels 1–3). Verbalizations user experience were frequent mostly relevant to identification issues. Explanations redesign proposals also relevant, but infrequent. relevance experience, explanations, showed did not clarify trade-off between rich test reactivity. Action descriptions system observations—two...

It is all too common for products, such as consumer appliances, information systems, mobile apps, and websites, to cause trouble frustration. For example, products are often difficult or dull use, make tasks less flexible more tedious, shift attention away from important gratifying activities, simply fail deliver expected benefits experiences. By identifying frustration in the lab prior widespread usability tests have proven a valuable method informing redesign efforts. A test consists of...

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