WGU D654 / DES 3300 Prototyping and Iterating I Objective
Assessment Practice V2 150 Scenario-Based Questions, Answers
& Detailed Rationales 2026
This exam assesses mastery of prototyping fundamentals, iterative design processes, low- and high-fidelity
prototyping, user feedback and testing, iteration techniques, prototyping tools, usability, and design
documentation. It emphasizes applying iterative design principles to real-world scenarios and evaluating
prototypes for user experience. It contains 50 multiple-choice questions, each with four distractors and a fully
worked rationale that explains why the keyed answer is correct. Questions are organized into clearly labelled
sections that mirror the major content areas of the course. Targeted learning outcomes include: Apply iterative
design processes to refine prototypes based on user feedback.; Select appropriate fidelity levels and tools for
prototyping based on project constraints and goals.; Conduct usability tests and synthesize findings to inform
design iterations.; Document and communicate design decisions and prototype evolution effectively.. Every item
has been reviewed for clinical accuracy, current guidelines, and clarity so that students can study with confidence
and self-correct as they work through the bank. Use it as a high-yield review immediately before the exam, or as a
structured practice tool during the unit - the rationales double as concise teaching notes. The recommended
writing time is 3 hours, with a passing score of 80% (A+ requires 95%+). Aligned with This exam adheres to US
university standards for undergraduate design and prototyping courses, aligning with WGU and industry best
practices. standards and reflects the question style commonly seen on accredited program examinations. Students
Section 1: General (Questions 1-50)
1 Which prototyping approach best validates navigation flow in early design?
A) High-fidelity interactive prototype with realistic animations
B) Low-fidelity paper prototype with clickable wireframes
C) Wizard-of-Oz prototype simulating backend responses
D) Functional prototype coded in production environment
Answer: B
Rationale: Low-fidelity paper prototypes with clickable wireframes are ideal for
early navigation flow validation because they are quick, cheap, and focus on
structure over aesthetics. High-fidelity prototypes introduce visual and interactive
details that can distract from flow testing, while Wizard-of-Oz and functional
prototypes are more suited for later stages or specific feature testing.
2 When should a designer switch from low-fidelity to high-fidelity prototypes?
A) After completing a heuristic evaluation
B) When the design concept is validated and detailed feedback is needed
C) Immediately after the first usability test
D) Before conducting any user testing
Answer: B
Rationale: Transition to high-fidelity prototypes occurs once the core concept is
,validated and the team needs detailed feedback on visual design, micro-interactions,
or technical feasibility. Heuristic evaluation can be done at any fidelity, and user
testing should begin with low-fidelity to catch major issues early.
3 What is the primary purpose of a heuristic evaluation in iterative design?
A) To gather quantitative data on task completion times
B) To identify usability problems based on established principles
C) To test the prototype with real users in a lab setting
D) To measure user satisfaction through surveys
Answer: B
Rationale: Heuristic evaluation is an expert review method where evaluators assess
the interface against usability principles (e.g., Nielsen's heuristics) to identify issues
without user involvement. It is not a user testing method and does not primarily
yield quantitative metrics.
4 Which metric best indicates prototype usability during iterative testing?
A) Number of features implemented
B) Task success rate and error frequency
C) Code coverage percentage
D) Visual appeal rating
Answer: B
Rationale: Task success rate and error frequency are direct behavioral measures of
usability, showing how effectively users can complete tasks. Other options like
feature count or code coverage are not user-centered, and visual appeal is subjective
and not a core usability metric.
5 In A/B testing, what is the key requirement for valid comparison?
A) Both versions must be high-fidelity
B) Only one variable should differ between versions
C) Participants must be usability experts
D) Testing must occur in a controlled lab
Answer: B
Rationale: A/B testing requires isolating a single variable to attribute differences in
performance to that change. Fidelity level, participant expertise, and testing
environment are not strict requirements, though controlled conditions can reduce
noise.
6 Which documentation artifact best captures design rationale for future iterations?
, A) User story map
B) Design decision log
C) Wireframe repository
D) Usability test script
Answer: B
Rationale: A design decision log records the context, options considered, and
rationale behind design choices, which is invaluable for future iterations and
onboarding. Other artifacts like user story maps or wireframes capture requirements
or layouts but not the reasoning.
7 What is a key advantage of using Figma for high-fidelity prototyping?
A) It automatically generates code for production
B) It supports real-time collaboration and interactive components
C) It requires no learning curve for beginners
D) It is exclusively for low-fidelity wireframing
Answer: B
Rationale: Figma enables real-time collaboration and allows designers to create
interactive components with transitions and animations, making it suitable for
high-fidelity prototypes. It does not auto-generate production code, has a learning
curve, and supports both low and high fidelity.
8 How does iterative design reduce risk in product development?
A) By eliminating the need for user testing
B) By allowing early detection and correction of design flaws
C) By ensuring the first prototype is perfect
D) By reducing the number of design iterations
Answer: B
Rationale: Iterative design involves repeated cycles of prototyping, testing, and
refinement, which helps identify and fix issues early when changes are less costly. It
does not remove the need for testing, guarantee perfection, or necessarily reduce the
number of iterations.
9 Which prototyping tool is most appropriate for creating a clickable mobile app
prototype?
A) Adobe Photoshop
B) Sketch with InVision
C) Microsoft Excel
D) AutoCAD
Assessment Practice V2 150 Scenario-Based Questions, Answers
& Detailed Rationales 2026
This exam assesses mastery of prototyping fundamentals, iterative design processes, low- and high-fidelity
prototyping, user feedback and testing, iteration techniques, prototyping tools, usability, and design
documentation. It emphasizes applying iterative design principles to real-world scenarios and evaluating
prototypes for user experience. It contains 50 multiple-choice questions, each with four distractors and a fully
worked rationale that explains why the keyed answer is correct. Questions are organized into clearly labelled
sections that mirror the major content areas of the course. Targeted learning outcomes include: Apply iterative
design processes to refine prototypes based on user feedback.; Select appropriate fidelity levels and tools for
prototyping based on project constraints and goals.; Conduct usability tests and synthesize findings to inform
design iterations.; Document and communicate design decisions and prototype evolution effectively.. Every item
has been reviewed for clinical accuracy, current guidelines, and clarity so that students can study with confidence
and self-correct as they work through the bank. Use it as a high-yield review immediately before the exam, or as a
structured practice tool during the unit - the rationales double as concise teaching notes. The recommended
writing time is 3 hours, with a passing score of 80% (A+ requires 95%+). Aligned with This exam adheres to US
university standards for undergraduate design and prototyping courses, aligning with WGU and industry best
practices. standards and reflects the question style commonly seen on accredited program examinations. Students
Section 1: General (Questions 1-50)
1 Which prototyping approach best validates navigation flow in early design?
A) High-fidelity interactive prototype with realistic animations
B) Low-fidelity paper prototype with clickable wireframes
C) Wizard-of-Oz prototype simulating backend responses
D) Functional prototype coded in production environment
Answer: B
Rationale: Low-fidelity paper prototypes with clickable wireframes are ideal for
early navigation flow validation because they are quick, cheap, and focus on
structure over aesthetics. High-fidelity prototypes introduce visual and interactive
details that can distract from flow testing, while Wizard-of-Oz and functional
prototypes are more suited for later stages or specific feature testing.
2 When should a designer switch from low-fidelity to high-fidelity prototypes?
A) After completing a heuristic evaluation
B) When the design concept is validated and detailed feedback is needed
C) Immediately after the first usability test
D) Before conducting any user testing
Answer: B
Rationale: Transition to high-fidelity prototypes occurs once the core concept is
,validated and the team needs detailed feedback on visual design, micro-interactions,
or technical feasibility. Heuristic evaluation can be done at any fidelity, and user
testing should begin with low-fidelity to catch major issues early.
3 What is the primary purpose of a heuristic evaluation in iterative design?
A) To gather quantitative data on task completion times
B) To identify usability problems based on established principles
C) To test the prototype with real users in a lab setting
D) To measure user satisfaction through surveys
Answer: B
Rationale: Heuristic evaluation is an expert review method where evaluators assess
the interface against usability principles (e.g., Nielsen's heuristics) to identify issues
without user involvement. It is not a user testing method and does not primarily
yield quantitative metrics.
4 Which metric best indicates prototype usability during iterative testing?
A) Number of features implemented
B) Task success rate and error frequency
C) Code coverage percentage
D) Visual appeal rating
Answer: B
Rationale: Task success rate and error frequency are direct behavioral measures of
usability, showing how effectively users can complete tasks. Other options like
feature count or code coverage are not user-centered, and visual appeal is subjective
and not a core usability metric.
5 In A/B testing, what is the key requirement for valid comparison?
A) Both versions must be high-fidelity
B) Only one variable should differ between versions
C) Participants must be usability experts
D) Testing must occur in a controlled lab
Answer: B
Rationale: A/B testing requires isolating a single variable to attribute differences in
performance to that change. Fidelity level, participant expertise, and testing
environment are not strict requirements, though controlled conditions can reduce
noise.
6 Which documentation artifact best captures design rationale for future iterations?
, A) User story map
B) Design decision log
C) Wireframe repository
D) Usability test script
Answer: B
Rationale: A design decision log records the context, options considered, and
rationale behind design choices, which is invaluable for future iterations and
onboarding. Other artifacts like user story maps or wireframes capture requirements
or layouts but not the reasoning.
7 What is a key advantage of using Figma for high-fidelity prototyping?
A) It automatically generates code for production
B) It supports real-time collaboration and interactive components
C) It requires no learning curve for beginners
D) It is exclusively for low-fidelity wireframing
Answer: B
Rationale: Figma enables real-time collaboration and allows designers to create
interactive components with transitions and animations, making it suitable for
high-fidelity prototypes. It does not auto-generate production code, has a learning
curve, and supports both low and high fidelity.
8 How does iterative design reduce risk in product development?
A) By eliminating the need for user testing
B) By allowing early detection and correction of design flaws
C) By ensuring the first prototype is perfect
D) By reducing the number of design iterations
Answer: B
Rationale: Iterative design involves repeated cycles of prototyping, testing, and
refinement, which helps identify and fix issues early when changes are less costly. It
does not remove the need for testing, guarantee perfection, or necessarily reduce the
number of iterations.
9 Which prototyping tool is most appropriate for creating a clickable mobile app
prototype?
A) Adobe Photoshop
B) Sketch with InVision
C) Microsoft Excel
D) AutoCAD
