Making, Quality & Evaluation
Making, Quality and Evaluation
Once a design has been fully developed, the final stage of the non-exam assessment moves from planning to production. This lesson covers how a prototype is manufactured safely and accurately, how its quality is checked against the specification, and how it is tested and evaluated once complete — including assessing its environmental impact. These skills run through the whole project, so it is worth understanding exactly what each stage demands.
Manufacturing the Prototype
Manufacturing a high-quality prototype means selecting the right materials, tools and techniques for the job. This includes hand tools, machinery and digital manufacture, alongside fixtures, templates, patterns and a jig where components need to be repeated accurately. Every choice should be justified — a student who explains why a material or tool was chosen shows more understanding than one who simply lists what was used, and this justification is what lifts an answer.
Accuracy also depends on working within tolerance and cutting materials efficiently to minimise waste. A prototype that is 3 mm out on a joint might still fit, but one that is 3 cm out will not — checking measurements regularly during manufacture, not just at the end, prevents small errors becoming large ones that cannot be corrected later.
Safe working practice must be demonstrated for both the maker and others throughout manufacture — for example wearing appropriate protective equipment, using guards on machinery and keeping a tidy, hazard-free workspace.
Quality and Accuracy
Once the prototype is complete, its quality must be checked. This means measuring the degree to which it performs as intended and confirming it is accurately assembled and finished. Quality control should happen throughout manufacture, not only at the end, so problems can be corrected before more time and material is wasted.
A student making a set of four identical box lids checks each one against the working drawing after cutting, tests that every lid fits its box before assembly, and inspects the applied finish for an even colour with no brush marks. Any lid that fails a check is reworked or remade before moving on, rather than being left until the end.
Accuracy is how closely a prototype matches its working drawing and specification; quality also includes the standard of finish, assembly and how well it performs its intended function.
Testing Under Realistic Conditions
A finished prototype must be tested under realistic conditions to check it is fit for purpose. This means using the product as the intended user would, not just checking it looks correct. Results should be recorded and compared against the product specification written earlier in the project.
A student designs a phone stand for use at a bedside. To test it under realistic conditions, they place a phone on the stand at different angles, check it does not tip when the screen is tapped, and leave it in position overnight to see whether it holds its shape. Each result is compared against the specification point it was meant to satisfy.
Evaluating Against the Specification
Evaluation means analysing the results of testing and judging whether the prototype meets each point of the product specification. A strong evaluation does not just describe what happened — it weighs up strengths and weaknesses, considers what could be changed, and reaches a conclusion about how successful the prototype is overall.
Sustainability is evaluated using a life cycle assessment (LCA). This considers the impact of extracting raw materials, manufacturing and transporting the product, its use by the consumer, and what happens to it once it is thrown away or recycled.
A life cycle assessment covers four key stages: raw material extraction, manufacture and transportation, use by the consumer, and final disposal or recycling.
Choosing the Right Command Word
Make and evaluate questions often use different command words that require different responses. “Describe” asks for the main steps or features of something. “Discuss” asks students to identify the issue in the question, explore all aspects of it with reasoning, and come to a conclusion. “Evaluate” goes further — it needs a substantiated judgement built from weighing up strengths, weaknesses and alternatives, supported by evidence. Treating these command words as interchangeable is one of the most common reasons marks are lost.
“Calculate” questions also need care. Marks are awarded for the correct method as well as the final answer, so workings should always be shown. For example, if a batch of components needs 250 mm strips of timber cut from 2400 mm stock lengths costing £3.20 each, the method is \(\text{stock length} \div \text{piece length}\) to find pieces per length, then \(\text{components needed} \div \text{pieces per length}\), rounded up, to find the number of stock lengths, before multiplying by the price per length.