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ITECH3001 User ExperienceLecture 6Usability Testing
2Recap on last week•Covered the important role direct manipulation plays whichwe often overlook.•Discussed the different ways we can interact withtechnology and the limitations and advantages. Theseincluded:–Keyboards–Pointing devices–Speech (AI)–Touch screens–Output devices•Looked at the role of other AI technologies such as gestureand haptic devices
3Learning objectives•Understand what evaluation is and itsimportance•Why testing is important particularly from theperspective of reducing costs•Learn what the characteristics of evaluations are•Understand the features of usability evaluationsand testing•Learn how to design and conduct a usability test•See the different usability testing facilities(Shneiderman & Plaisant Ch 4)
4What is evaluation?•Using different methods at different times to elicit userfeedback.•Purpose is to check if users can use the product and likeit. More than just a usable system must be pleasing touse.•Feedback should focus on those areas of the system thatimpact on users’ use of the system.–Does it do what users expected it to do?–Is the functionality from a user perspective correct?–Is the workflow appropriate?
5Task 1Why should systems be evaluated? Talk about thekey reasons and then identify your top three.Are there costs if you do not evaluate systemsappropriately?
6What to evaluate? Four levelsHCIConcernDescriptionSample MeasureItems1. PhysicalSystem fits our physicalstrengths and limitationsno harm to healthLegibleAudibleSafe to use2. CognitiveSystem fits our cognitivestrengths and limitationsand functions – the waywe think and learnFewer errors - easyrecoveryEasy to useEasy to rememberhow to useEasy to learn
7Four levels cont..HCI ConcernDescriptionSample Measure Items3. AffectiveSystem satisfiesour aesthetic andaffective needs isattractiveAesthetically pleasing,engagingTrustworthySatisfyingEnjoyable, entertaining,fun4. UsefulnessUsing the systemis rewardingSupports our tasksCan do some tasks notpossible without thesystemExtends our capability
8Evaluation planningDesigners can become so entranced with theircreations that they may fail to evaluate themadequately. Experienced designers have attainedthe wisdom and humility to know that extensivetesting is a necessity.(Shneiderman and Plaisant pg 150).
9When to evaluate?Formative Evaluation:–conducted during development helps inform designdecisions.Summative Evaluation:–conducted after implementation to ensure meetscertain standards or satisfies certain requirementsUse and Impact Evaluation:–conducted during the actual product use by real usersin real context.