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HCI - Evaluation

EvaluationWhy Evaluate? In HCI we evaluate interfaces and systems to: Determine how usable they are for different user groups Identify good and bad features to inform future design Compare design choices to assist us in making decisions Observe the effects of specific interfaces on users Why now? Evaluation is key component of HCI Evaluation is a process, not an event Design ideas from Evaluation of existing technologies Making things better starts by evaluationEvaluation Methods Inspection methods (no users needed!) heuristic evaluations Walkthroughs Other Inspections User Tests (users needed!) Observations/Ethnography Usability tests/ Controlled ExperimentsHeuristic Evaluation heuristic Evaluation (what is it?) Method for finding usability problems Popularised by Jakob Nielsen Discount usability engineering Use with working interface or scenario Convenient Fast Easy to useHeuristic Evaluation Systematic inspection to see if interface complies to guidelines Method 3-5 inspectors usability engineers, end users, double inspect interface in isolation (~1 2 hours for simple interfaces) compare notes afterwards single evaluator only catches ~35% of usability problems, 5 evaluators catch 75% Works for paper, prototypes, and working systemsPoints of Variation Evaluators Heuristics used Method employed during inspectionEvaluators These people can be novices or experts novice evaluators regular specialists double specialists (- Nielsen) Each eval

Phases of a heuristic evaluation 1. Pre-evaluation training – give evaluators needed domain knowledge and information on the scenario 2. Evaluate interface independently 3. Rate each problem for severity 4. Aggregate results 5. Debrief: Report the results to the interface designers

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