Prototype development, including making models and prototypes to test and evaluate ideas, gathering feedback from users, and refining a design against the specification.

What this dot point is asking

This is AQA section 3.3.5. AQA wants you to understand how a design is developed into a prototype, tested, and refined. You need to explain the role of models and prototypes, how feedback and testing are used, and how the design is improved against the specification. In Paper 1 this is examined through Explain and Describe questions linking prototyping to the iterative cycle and to reducing risk before manufacture.

Models and prototypes

Models are quick and cheap, made in easy-to-work materials such as card, foam board, modelling foam or, for textiles, a calico toile. They answer single questions (does this shape feel right, does it fit the space) before any commitment. A prototype is closer to the final product, made in representative materials, and tests the design as a whole. CAD and 3D printing now let designers produce accurate prototypes quickly, sometimes called rapid prototyping, which speeds up the cycle.

Testing and feedback

Testing should be objective where possible: measure the prototype against each measurable specification point (does it hold 2 litres, does it weigh under 500 g) rather than relying on opinion alone. User trials add the subjective view of how it feels to use, which the designer cannot judge alone. Recording results against the specification gives clear evidence of what passes and what needs changing.

Refining the design

Results from testing and feedback are used to refine the design: weak parts are strengthened, errors corrected, uncomfortable features reshaped, and the product brought closer to every specification criterion. This is the heart of the iterative cycle: make, test, evaluate and improve, repeated until the product succeeds. Doing this on a prototype means faults are fixed cheaply, before manufacture commits to tooling and large stock.