Human Computer Interaction (IT-803 (B)) - Important Questions

Explain the process of usability testing (validation). Describe test planning, participant selection, task design, data collection methods, metrics to record and how to report findings to stakeholders.

Define heuristic evaluation. Explain Nielsen's 10 usability heuristics and describe the procedure for conducting a heuristic evaluation including roles, checklist creation, and severity rating.

What is a cognitive walkthrough? Explain its steps, the questions asked at each step, and give an example of applying cognitive walkthrough to a login screen.

Define the primary usability metrics: effectiveness, efficiency and satisfaction. For each metric give measurable indicators (for example, completion rate, time on task, error rate, and satisfaction scales) and explain how they are calculated.

What is the System Usability Scale (SUS)? Explain how SUS responses are scored and interpreted. Provide the scoring formula.

Compare laboratory usability testing and field (in-situ) usability testing. Discuss advantages, disadvantages, typical applications, and factors that influence the choice between them.

Design a complete usability test for a mobile banking application feature (fund transfer). Include objective, hypotheses, participant sampling, test tasks, metrics to collect, pilot testing plan, data analysis approach and how you would present results to stakeholders.

Explain the think-aloud protocol used in usability testing. Differentiate between concurrent think-aloud and retrospective think-aloud, and discuss strengths and limitations of each.

Describe statistical methods commonly used in usability studies (for example, $t$-test, ANOVA, Mann-Whitney U test). Explain when to use parametric versus non-parametric tests, and define what an effect size is and why it matters.

Explain accessibility evaluation for user interfaces. Describe WCAG principles (Perceivable, Operable, Understandable, Robust), common accessibility testing methods and tools, and how accessibility findings are integrated into usability reports.

Compare low-fidelity and high-fidelity prototypes for usability testing. Discuss benefits, limitations and appropriate evaluation methods for each fidelity level.

Let $s_i$ be the SUS response for item $i$ on a 1--5 scale, and let $s'_i$ be the adjusted score where for odd $i$ $s'_i = s_i - 1$ and for even $i$ $s'_i = 5 - s_i$. Provide the formula for the overall SUS score.