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...

To better support usability practice, most research focuses on evaluation methods. New ideas in are mostly proposed as new Many publications describe experiments that compare Comparisons may indicate some methods have important deficiencies, and thus often advise practitioners to prefer a specific method particular situation. An expectation persists human–computer interaction (HCI) results about should be the standard "unit of contribution" rather than favoring larger units (e.g., work...

Reading of electronic documents is becoming increasingly important as more information disseminated electronically. We present an experiment that compares the usability a linear, fisheye, and overview+detail interface for documents. Using these interfaces, 20 subjects wrote essays answered questions about scientific Essays written using received higher grades, while fisheye read faster. However, used time to answer with interface. All but one subject preferred The most common in practical...

We present an exploration of reading patterns and usability in visualizations electronic documents. Twenty subjects wrote essays answered questions about scientific documents using overview+detail, a fisheye, linear interface. study by progression maps that visualize the subjects' activity, visibility show for how long different parts document are visible. The help explain differences between interfaces affect way read. With overview+detail interface, get higher grades their essays. All but...

Usability problems predicted by evaluation techniques are useful input to systems development; it is uncertain whether redesign proposals aimed at alleviating those likewise useful. We present a study of how developers large web application assess usability and as their development. Problems were generated 43 evaluators using an inspection technique think aloud testing. Developers assessed have higher utility in work than problems. In interviews they explained gave them new ideas for...

A user interface study concerning the usage effectiveness of selected retrieval modes was conducted using an experimental text system, TeSS, giving access to online documentation certain programming tools. Four TeSS were compared: (1) browsing, (2) conventional boolean retrieval, (3) based on Venn diagrams, and (4) these three combined. Further, compared use printed manuals. The subjects observed 87 computing new them. In experiment manuals is faster provides answers higher quality than any...

Usability inspection techniques are widely used, but few focus on users' thinking and many appropriate only for particular devices use contexts. We present a new technique (MOT) that guides by metaphors of human thinking. The concern habit, the stream thought, awareness associations, relation between utterances knowing. main novelty MOT is its psychological basis combined with to stimulate inspection. first three experiments shows usability problems uncovered more serious complex repair than...

Matching of usability problem descriptions consists determining which are similar and not. In most comparisons evaluation methods matching helps determine the overlap among evaluators. However, has received scant attention in research may be fundamentally unreliable. We compare how 52 novice evaluators match same set from three think aloud studies. For use either (a) similarity solutions to problems, (b) a prioritization effort for owner application tested, (c) model proposed by Lavery...

Background: Patients suffering from depression have a high risk of relapse and readmission in the weeks following discharge inpatient wards. Electronic self-monitoring systems that offer patient-communication features are now available to daily support patients, but usability, acceptability, adherence these has only been sparsely investigated. Objective: We aim test adherence, clinical outcome newly developed computer-based electronic self-assessment system (the Daybuilder system) patients...

A new usability inspection technique based on metaphors of human thinking has been experimentally compared to heuristic evaluation (HE). The aim (MOT) is focus users' mental activity and make easily applicable different devices use contexts. Building classical introspective psychology, MOT bases habit formation, stream thought, awareness associations, the relation between utterances knowing. An experiment was conducted in which 87 novices evaluated a large Web application, its key developer...

Recent criticism of think-aloud testing (TA) discusses discrepancies between theory and practice, the artificiality test situation, inconsistencies in evaluators' interpretation process. Rather than enforcing a more strict TA procedure, we describe Cooperative Usability Testing (CUT), where users evaluators join expertise to understand usability problems application evaluated. CUT consists two sessions. In interaction session, user tries out uncover potential while mainly observe, e.g. as or...

ABSTRACT The evaluator effect names the observation that usability evaluators in similar conditions identify substantially different sets of problems. Yet little is known about factors involved effect. We present a study 50 novice evaluators' tests and subsequent comparisons, teams individually, resulting same problems were analyzed independently by 10 human–computer interaction experts. shows an agreement between 40%, indicating substantial Team matching following individual appears to...

Daybuilder is an experimental smartphone app intended to support people with depression. It was designed in collaboration six participants who had all received antidepressant medication within the last two years. The prototype field tested same for three four weeks. All were interested using application like Daybuilder, immediately or future if they suffer from depression again. study has shown it possible design a that find interesting and potentially supportive their daily lives clinical...

Journal Article Tracing impact in a usability improvement process Get access Tobias Uldall-Espersen, Uldall-Espersen ⁎ Department of Computer Science, University Copenhagen, Universitetsparken 1, DK-2100 Copenhagen OE, Denmark Corresponding author. Tel.: +45 35321451; fax: 35321401. E-mail addresses:tobiasue@diku.dk (T. Uldall-Espersen), erikf@diku.dk (E. Frøkjær), kash@diku.dk (K. Hornbæk). Search for other works by this author on: Oxford Academic Google Scholar Erik Frøkjær, Frøkjær Kasper...

The utility and impact of a usability evaluation depend on how well its results align with the business goals system under evaluation. However, to achieve such alignment is not understood. We propose simple technique that requires active consideration system's in planning reporting evaluations. tested an experiment 44 novice evaluators using think aloud testing. considering report fewer problems compared did use technique. company commissioning evaluation, however, assesses those 30-42%...

Patients with major depression exhibit circadian disturbance of sleep and mood, when they are discharged from inpatient wards, this poses a risk relapse. We developed reinforcement therapy (CRT) intervention to facilitate the transition ward home for these patients. CRT focuses on increasing zeitgeber strength clock through social contact, physical activity, diet, daylight exposure, timing.In study, we aimed prevent worsening after discharge by using CRT, supported an electronic...

Inspection techniques are widely used during systems design as a supplement to empirical evaluations of usability. Psychology-based inspection could give important insights into how thinking shapes interaction, yet most do not explicitly consider users' thinking. We present an experiment comparing two psychology-based techniques, cognitive walkthrough (CW) and metaphors human (MOT). Twenty participants evaluated web sites for e-commerce while keeping diaries problems experienced with the...

The user interfaces of the most popular search engines are largely same. Typically, users presented with an ordered list documents, which provide limited help if having trouble finding information they need. This article presents interface called Venn Diagram Interface (VDI) that offers improved transparency. VDI allows to see how each term, or group terms, in a query contributes entire result set search. Furthermore, it browse sets generated by these terms. In test 10 participants, was...

Preliminary results from a clinical study concerning the feasibility of using self-monitoring system in psychiatric care are presented. At end hospital treatment for depression 32 patients were enrolled study. The used at home during 4-week period. Data case report forms show that clear majority find supported them getting better overview their symptoms. 12 out even found could help catch an upcoming depression. A it important use was combined with communication and information sharing...

Descriptions of problems found in usability evaluations aim to help developers improve an interactive system. However, little is know about what makes a problem description useful developers. The present paper describes how four assessed the utility 619 and relates their assessments characteristics were described. Developers find descriptions that are clear, propose solutions, elaborate on why something significantly higher than without such information. Problems coded as persistent for...