NivaarExam PrepOfficial exam papers ↗

19-Soft-B2 User Interface · May 2015

Question 4 of 14: The Business Case for User-Centered Design

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

Notes on this paper

National Exams, May 2015 — 04-Soft-B2, User Interface (closed book, 3 hours). Part A: answer any FIVE of the NINE questions (10 marks each); Part B: answer ALL FIVE questions (10 marks each), all based on the same case study — Happy Medical Clinic, a Toronto medical clinic switching from paper-based practice to an electronic health record (EHR) system purchased from VisualEHR Inc., an off-the-shelf vendor willing to customize the product to the clinic's needs. Most questions call for essay-format answers; clarity and organisation count. This solution answers all fourteen questions as a full study resource.

Reference texts. Rogers, Sharp & Preece, Interaction Design: Beyond Human-Computer Interaction, 5th ed., Ch. 1–3 (interaction design, cognitive aspects, mental models), Ch. 9–10 (prototyping, personas), Ch. 11–12 (data gathering, requirements), Ch. 15–16 (evaluation, lab vs. field studies); Nielsen, Usability Engineering, Ch. 4–6 (usability heuristics, iterative design, usability testing); Shneiderman, Designing the User Interface, 6th ed., Ch. 2 (guidelines, principles), Ch. 12 (internationalization); Norman, The Design of Everyday Things, Ch. 1–4 (visibility, affordances, feedback, conceptual models).

Question 4: The Business Case for User-Centered Design (10 marks)

Question text not reproduced: the examination questions are © Engineers and Geoscientists BC. Open the official past paper (linked at the top of this page) to read the question, then follow the worked solution below.

Check: the question reads “Summarize four (5) supporting arguments” — the word and the parenthetical numeral disagree (a typing slip). Answered with FIVE (5) arguments, matching the parenthetical numeral and the paper's convention of stating counts explicitly (e.g. Q7's “two distinct concerns,” Q8's “five (5) steps”).

Five arguments for treating UCD as a sound financial investment, not an added cost:

  1. Reduced rework and development cost. Usability problems found late (after release) cost far more to fix than the same problem found early in a low-fidelity prototype — industry data consistently shows the cost of a fix rising by an order of magnitude at each stage a defect survives past (design → build → release). Catching Happy Medical Clinic's charting-workflow mismatch during prototype review, rather than after go-live, avoids an expensive re-engineering pass.
  2. Reduced support and training cost. A UCD-designed interface that matches real user tasks and mental models requires less help-desk support and shorter, cheaper training — a direct, measurable saving in a company selling to many customer sites (or, for a clinic, in every new staff member's onboarding time), since every unresolved usability problem is a recurring cost paid by every user, every time.
  3. Higher user productivity and lower error rates. A usable interface lets staff complete tasks faster and with fewer errors, which for clinical software translates directly into clinician time saved per patient and fewer costly data-entry mistakes (wrong medication, wrong chart) — a quantifiable operational saving that management can weigh against UCD's cost.
  4. Competitive differentiation and customer retention. In a market with multiple vendors offering broadly similar functionality (as in EHR software), usability becomes a genuine purchase and renewal criterion; a demonstrably more usable product wins and retains customers who would otherwise churn to a competitor over daily frustration with the interface.
  5. Reduced liability and compliance risk. For safety- or privacy-relevant software (clinical data, patient records), usability failures are not merely inconvenient — they are a documented source of real errors and incidents; UCD's evaluation activities produce an audit trail showing that user-error risks were actively identified and mitigated, which reduces both the likelihood and the legal exposure of a serious incident.