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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 2 of 2 (0.059 seconds)Spelling suggestions: "subject:"roughness"" "subject:"thorough""
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Usability Problem Description and the Evaluator Effect in Usability TestingCapra, Miranda Galadriel 05 April 2006 (has links)
Previous usability evaluation method (UEM) comparison studies have noted an evaluator effect on problem detection in heuristic evaluation, with evaluators differing in problems found and problem severity judgments. There have been few studies of the evaluator effect in usability testing (UT), task-based testing with end-users. UEM comparison studies focus on counting usability problems detected, but we also need to assess the content of usability problem descriptions (UPDs) to more fully measure evaluation effectiveness. The goals of this research were to develop UPD guidelines, explore the evaluator effect in UT, and evaluate the usefulness of the guidelines for grading UPD content.
Ten guidelines for writing UPDs were developed by consulting usability practitioners through two questionnaires and a card sort. These guidelines are (briefly): be clear and avoid jargon, describe problem severity, provide backing data, describe problem causes, describe user actions, provide a solution, consider politics and diplomacy, be professional and scientific, describe your methodology, and help the reader sympathize with the user. A fourth study compared usability reports collected from 44 evaluators, both practitioners and graduate students, watching the same 10-minute UT session recording. Three judges measured problem detection for each evaluator and graded the reports for following 6 of the UPD guidelines.
There was support for existence of an evaluator effect, even when watching pre-recorded sessions, with low to moderate individual thoroughness of problem detection across all/severe problems (22%/34%), reliability of problem detection (37%/50%) and reliability of severity judgments (57% for severe ratings). Practitioners received higher grades averaged across the 6 guidelines than students did, suggesting that the guidelines may be useful for grading reports. The grades for the guidelines were not correlated with thoroughness, suggesting that the guideline grades complement measures of problem detection.
A simulation of evaluators working in groups found a 34% increase in severe problems found by adding a second evaluator. The simulation also found that thoroughness of individual evaluators would have been overestimated if the study had included a small number of evaluators. The final recommendations are to use multiple evaluators in UT, and to assess both problem detection and description when measuring evaluation effectiveness. / Ph. D.
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Strokekedjan från början till slut : En etnografisk studie om farlighet och tid i en akut vårdkedja / An ethnographic study of decisionmaking during handling of acute stroke patientsStåhl, Sally January 2012 (has links)
Varje år drabbas 30 000 svenskar av stroke, vilket innebär stora personliga omställningar och stora kostnader för samhället. Den mest effektiva behandlingen, trombolys, måste ges så snart som möjligt för att ha god effekt. Samtidigt som det är av största vikt att ta reda på om patienten har några differentialdiagnoser som gör behandlingen riskfylld. Den här studien undersöker hur strokekedjan går till och vilka faktorer som påverkar beslutsfattandet. Studien är baserad på etnografiska fältstudier på fyra svenska sjukhus och materialet är analyserat med metoder från sammansatta kognitiva system och målorienterad design. Resultaten visar att trots olika organiserade strokekedjor på de olika sjukhusen är processerna desamma och direkt kommunikation är mest framgångsrik för att effektivt sprida information mellan dem. Neurologjouren är viktig roll som, liksom resten av aktörerna i strokekedjan, ständigt balanserar sitt beslutsfattande mellan effektivitet och grundlighet. Kombinationen av analyser ger resultat både på system- och individnivå. Möjligheter för förbättrade strokekedjor ges i termer av logistiska, tekniska och organisatoriska förslag. / 30 000 people in Sweden get a stroke every year. This leads to large personal adaptions as well as high costs for the society. The most efficient treatment, thrombolysis, must be given as soon as possible to have a good effect. At the same time it is very important to find out if the patient has any differential diagnosis that can make the treatment hazardous. This study investigates how the course ov events around acute stroke patients take place and important factors for the decision making. The studiy is based on ethnographic field studys on four swedish hospitals. The material is analysed with methods from joint cognitive systems and goal-oriented design. The results show that in spite of different organisation of the course of events around acute stroke patients are the processes and direct communication most successful for effective spread of information between the processes. The neurologist on call is an important roll who, as well as the rest of the participants in the course of events, balances the decision making between efficiency and thoroughness. The combination of analysis gives results on both system- and individual levels. Possibilites for improvents are given in three categories: logistic, technological and organizational.
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