IDEA9106 Chap.7 Prototypes and Fidelity Decisions
Prototypes and Fidelity Decisions
Prototypes and Fidelity Decisions frames a decision through prototype purpose, fidelity and assumption test.
The objective is to choose a prototype form based on the next question rather than visual polish, so the chapter should be read as a chain from problem definition to evidence, option comparison and accountable action.
Start with prototype purpose and name the decision owner, affected stakeholders and time horizon.
The same fact can matter differently across those positions, so the opening frame determines which evidence is relevant.
Use fidelity to explain how the present condition produces an opportunity, cost or risk. A strong mechanism states what changes, for whom and through which organisational, market or institutional process.
Apply assumption test when comparing options.
Keep criteria distinct, test trade-offs and ask which assumption drives the recommendation. A score or matrix only helps when its criteria are justified by the case.
For the application — choose a prototype form based on the next question rather than visual polish — finish with an actor, action, rationale and review trigger.
This turns analysis into a recommendation while keeping the decision open to new evidence.
Build a decision ledger for Prototypes and Fidelity Decisions. Separate the current condition, the stakeholder affected, the evidence supporting prototype purpose, the mechanism represented by fidelity and the criterion supplied by assumption test.
If a recommendation cannot point back to one of those entries, it is probably preference dressed as analysis rather than a consequence of the case.
Compare at least two feasible options against the same criteria. State who benefits, who bears cost or risk, what capability implementation requires and what evidence would reveal failure.
This comparison is essential when students need to choose a prototype form based on the next question rather than visual polish, because an attractive option is not yet a defensible choice until its trade-offs are made visible.
Rehearse the IDEA9106 response as a short briefing: one sentence for the decision, two for the evidence and mechanism, one for the alternative and one for the qualified recommendation.
Then expand only the move that needs more support. This protects the argument structure when a report, presentation or timed case imposes a strict word or time limit.
A complete Prototypes and Fidelity Decisions response should make the task visible before the detail: identify what must be decided, define the relevant terms, connect the evidence to fidelity, and use assumption test to test the result.
The final sentence should answer the question actually asked rather than merely repeat the topic.
The controlling limit is specific: High fidelity can make an untested concept harder to challenge.
Keep that limit beside the worked example, because it separates a careful IDEA9106 answer from one that sounds confident but claims more than the task or evidence supports.
For revision, retrieve prototype purpose, fidelity and assumption test without notes, explain their relationship aloud, then complete a changed version of the application: choose a prototype form based on the next question rather than visual polish.
Record the first point at which your reasoning fails and repair that move before attempting another case.
What this chapter covers
- 01
prototype purpose
- 02
fidelity
- 03
assumption test
- 04
Applying prototype purpose
- 05
Limits of fidelity and assumption test
Worked example: Prototypes and Fidelity Decisions
- 1Extract the outcome, actor or operation that the Prototypes and Fidelity Decisions task actually requires.
- 1State the precondition under which prototype purpose is relevant rather than merely familiar.
- 1Use fidelity to reject the nearest alternative, then run a failure-path check with assumption test.
- 1Choose the response and state when it must be withdrawn or narrowed: High fidelity can make an untested concept harder to challenge.
Key terms
- lo-fi prototype and design fixation
- A low-fidelity prototype is a fast, inexpensive representation used for early learning; design fixation is the tendency to remain anchored to an existing idea or feature despite contrary evidence. In this chapter, use the concept when you choose a prototype form based on the next question rather than visual polish.
- how might we (HMW)
- A How Might We question converts a research insight into an open design challenge broad enough for alternatives but specific enough to guide ideation. In this chapter, use the concept when you choose a prototype form based on the next question rather than visual polish.
- usability testing and the System Usability Scale (SUS) questionnaire
- Usability testing observes representative users attempting defined tasks, while SUS is a standard ten-item questionnaire that converts perceived usability responses into a 0–100 score. In this chapter, use the concept when you choose a prototype form based on the next question rather than visual polish.
Prototypes and Fidelity Decisions FAQ
What is the main task in Prototypes and Fidelity Decisions?
Choose a prototype form based on the next question rather than visual polish.
How do prototype purpose and fidelity work together?
Use prototype purpose to establish the object or condition, then use fidelity to explain how it changes the outcome being analysed.
What must a IDEA9106 answer qualify here?
High fidelity can make an untested concept harder to challenge.
How should I revise Prototypes and Fidelity Decisions?
Retrieve prototype purpose, fidelity and assumption test, apply them to a changed case, and correct the first point where the evidence no longer supports the conclusion.
Assessment move
Reconstruct the relationship among prototype purpose, fidelity and assumption test; complete the chapter application without notes; then test the result against this limit: High fidelity can make an untested concept harder to challenge.
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