What standard stock forms do materials come in, and how are products made in quantity?
Stock forms, types and sizes of materials and standard components, and the manufacturing processes and scales of production from one-off to mass and continuous production.
A focused answer to AQA GCSE Design and Technology specialist principle on stock forms and manufacturing, covering standard stock forms and components, and the scales of production from one-off to continuous.
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What this dot point is asking
This is AQA section 3.2.6. AQA wants you to know that materials are sold in standard stock forms and sizes, that standard components save time and cost, and that products are made at different scales of production. You need to match a scale of production to a product and explain why standard sizes and components are used. In Paper 1 this is examined through Compare and Explain questions on the scales of production and the benefits of standard parts.
Stock forms and sizes
Stock form differs by material: timber comes as planks, boards and dowel; metal as sheet, bar, rod, tube and angle; polymers as sheet, rod, film, foam and the granules that feed injection moulding. Designing a part around the nearest standard size avoids the waste and cost of cutting from oversized stock.
Standard components
Because they are mass-produced by specialist suppliers to set sizes, standard components are cheap, reliable and interchangeable, so an assembler can fit them quickly and a user can replace a failed one easily. Making such parts in-house would be far more expensive, which is why even large manufacturers buy them in.
Scales of production
The scale is chosen mainly by demand and the cost that demand can justify.
- One-off (bespoke): a single, often custom, product such as a tailored suit, a bridge or a piece of jewellery. It is labour-intensive with a high cost per item, because the set-up cannot be shared.
- Batch: a set number made together, such as 500 chairs or a run of bread, after which the line is re-tooled for the next batch or variant. It is flexible and suits medium or varied demand, but re-setup raises the unit cost.
- Mass: very large numbers made continuously on a production line, such as cars or phones, using automation and a division of labour. The high set-up cost is spread over huge volume, giving a low unit cost, but the line is inflexible.
- Continuous: non-stop production, 24 hours a day, of the same simple product such as steel, paper, glass or chemicals, where stopping the plant is costly. It gives the lowest unit cost of all.
Exam-style practice questions
Practice questions written in the style of AQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AQA 20194 marksCompare batch production and mass production, explaining when a manufacturer would choose each.Show worked answer →
A 4-mark Compare wants contrasts on both sides, not two separate descriptions.
Batch production makes a set number of identical items together (for example 500 loaves or 200 chairs), then the line is re-tooled to make a different batch or variant. It is flexible and suits medium, varied or seasonal demand, but the unit cost is higher because of the re-setup time between batches.
Mass production makes very large numbers of the same item continuously on a production line (for example cars or drinks bottles). The high set-up cost is spread over huge volume, so the unit cost is low, but the line is inflexible and only worthwhile when demand is large and steady.
A manufacturer chooses batch for varied or limited runs and mass for a single high-demand product. Markers reward (1) the defining difference (set number with re-tooling versus continuous large volume), (2) flexibility versus low unit cost, (3) a matched choice of when to use each. Describing each in isolation without comparing caps the mark.
AQA 20213 marksExplain two advantages of using standard components in a mass-produced product.Show worked answer →
A 3-mark Explain wants two developed advantages.
First, standard components such as screws, hinges and bearings are bought in ready-made rather than manufactured in-house, which saves the time and cost of designing and making them, lowering the unit price. Second, they are made to consistent sizes and quality, so they fit reliably and can be easily replaced if they fail, which simplifies assembly and repair. A third point is that buying in bulk from suppliers is cheaper than small in-house production.
Markers reward two clear advantages, each with a consequence (saved time or cost, consistency, easy replacement). Naming components without explaining the advantage limits the marks.
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Sources & how we know this
- AQA GCSE Design and Technology (8552) specification — AQA (2017)