Do I need a fully working prototype for IB Design Technology?

Not always, and this is where many IB Design Technology students waste time. What matters is whether your prototype produces evidence that drives iteration. A partial prototype that tests one critical feature (like a joint, hinge, or grip) can be more valuable than a complete build that never gets tested. In your IA, you can score well with low-fidelity prototypes if you document tests, results, and improvements clearly. In exams, you should be able to explain why a low-fidelity prototype is appropriate early in development. The safest rule is simple: build what you can test, and test what you build.

Can CAD count as modeling and prototyping in IB Design Technology?

Yes, but only if it does real work for you in IB Design Technology. CAD becomes modeling when it communicates design intent (dimensions, form, assembly) and helps others understand the idea. It becomes a form of prototyping when you use it to test or simulate performance, such as checking clearances, tolerances, or stress points (FEA). A CAD render alone is usually presentation, not evidence. To make CAD “count,” pair it with a decision: what did the model reveal, and what did you change because of it? In exams, mention both advantages (speed, accuracy, repeatability) and limitations (assumptions, access, skill level).

How do I write better exam answers about modeling and prototyping?

Start by answering like a designer, not a describer. In IB Design Technology, the best answers use a tight chain: definition --> application in context --> advantage/limitation --> impact on the final outcome. Use command-term discipline: if the question says “evaluate,” you must weigh pros and cons and reach a justified conclusion. Keep one concrete example ready (packaging mock-up, ergonomic attachment, modular organizer) and use it to anchor your points. Then practice under time using RevisionDojo’s topic-specific sets, especially the B2.2 Modelling and Prototyping questionbank. The fastest improvement comes from feedback loops: attempt, review, refine, reattempt.