Clinical Informatics Certification Usability & Human-Computer Interaction 3 — Questions and Answers
Question 1: Which usability concept refers to the degree to which a design's appearance communicates how it should be used?
- Feedback
- Affordance (Correct answer)
- Mapping
- Constraint
Correct answer: Affordance
Affordance describes perceived properties of an object that suggest how it can be used, such as a button that looks pressable.
Question 2: What does 'task analysis' in HCI primarily seek to understand?
- Server-side processing speed
- The steps users take to complete goals within a system (Correct answer)
- Database query optimization
- Network bandwidth requirements
Correct answer: The steps users take to complete goals within a system
Task analysis breaks down user workflows into sequential steps to identify cognitive demands, decision points, and potential design improvements.
Question 3: A physician must remember a patient's ID number from one screen to enter it on the next screen. Which Nielsen heuristic is violated?
- Help and documentation
- Visibility of system status
- Recognition rather than recall (Correct answer)
- User control and freedom
Correct answer: Recognition rather than recall
Requiring users to recall information across screens violates recognition over recall; the system should keep relevant data visible or transfer it automatically.
Question 4: In a usability study, a 'within-subjects' design means:
- Each participant tests only one version of the interface
- All participants test all versions of the interface (Correct answer)
- Participants are matched by clinical role before assignment
- Testing is conducted within the clinical department only
Correct answer: All participants test all versions of the interface
In a within-subjects design, the same participants are exposed to all conditions, reducing variance due to individual differences.
Question 5: Which accessibility standard is most commonly referenced when designing EHRs for users with disabilities in the US?
- ISO 9241
- WCAG 2.1 (Correct answer)
- HL7 FHIR
- IEC 62366
Correct answer: WCAG 2.1
WCAG 2.1 (Web Content Accessibility Guidelines) provides the widely adopted criteria for making digital health interfaces accessible to users with disabilities.
Question 6: A clinical system presents a confirmation dialog before permanently deleting a patient record. This design pattern best exemplifies which heuristic?
- Visibility of system status
- Error prevention (Correct answer)
- Aesthetic and minimalist design
- Help users recognize, diagnose, and recover from errors
Correct answer: Error prevention
A confirmation step before an irreversible destructive action prevents accidental data loss, directly implementing the error prevention heuristic.
Question 7: The concept of 'mental model' in HCI refers to:
- The system's internal architecture as coded by developers
- A user's internal representation of how a system works (Correct answer)
- The formal specification of user interface components
- The documented workflow approved by clinical governance
Correct answer: A user's internal representation of how a system works
A mental model is the user's internal understanding of a system's behavior; good design aligns the system's actual model with users' expected mental models.
Clinical Informatics Certification Usability & Human-Computer Interaction 3
Which usability concept refers to the degree to which a design's appearance communicates how it should be used?