How do real factories cut waste and cost while keeping quality, and what does that mean for the way a product is designed?
Modern industrial and commercial practice including lean manufacturing and just-in-time production, automation and the use of robotics, standardisation and the use of standard components, quality control and quality assurance, and the social, moral and ethical responsibilities of manufacturers.
A focused answer to AQA A-Level Design and Technology Product Design 3.1.6, covering lean manufacturing, just-in-time production, automation, standardisation, quality control and assurance and the responsibilities of manufacturers.
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What this dot point is asking
AQA wants you to understand how modern factories actually run: how they cut waste and cost, automate, standardise parts and guarantee quality, and the responsibilities that come with manufacturing at scale. Paper 1 tests this as applied discussion, often about a named company or product.
Lean manufacturing and just-in-time
JIT frees up cash and space and exposes quality problems quickly because there is no buffer stock to hide them. Its risk is fragility: with no stock, any disruption to supply halts the whole line, so JIT depends on reliable suppliers and good communication. Kaizen (continuous improvement) supports lean by encouraging small, constant improvements from the whole workforce.
Automation and robotics
Automated and flexible manufacturing systems can be reprogrammed to make different products, so a single line can switch between variants without expensive retooling, which suits modern demand for variety.
Standardisation and standard components
Standardisation designs products around standard, bought-in components (screws, bearings, motors, connectors) rather than bespoke parts. This cuts cost (the components are mass-produced cheaply by specialists), speeds up assembly, makes repair easy (a standard part can be replaced) and improves reliability. It is a core idea linking manufacture to design for maintenance.
Managing quality
Quality is managed by two complementary ideas:
- Quality control (QC) inspects and tests products against a standard, using gauges, templates and measurement, and rejects those that fail. It catches faults after they happen.
- Quality assurance (QA) is a documented system designed to prevent faults from occurring at all, building quality into every stage. Good QA reduces the need for QC.
Sampling, tolerance checks and standards such as ISO 9001 (quality management) sit within this.
Responsibilities of manufacturers
Manufacturing at scale carries social, moral and ethical responsibilities: safe and fair working conditions, honest marketing, consumer safety, responsible sourcing of materials (avoiding child labour or conflict resources) and minimising environmental harm through waste, emissions and end-of-life impact. These responsibilities increasingly shape commercial decisions because consumers and legislation demand them.
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 20196 marksA car manufacturer uses just-in-time production with a lean manufacturing approach. Discuss the benefits and risks of just-in-time, and explain how it relates to lean manufacturing. [6 marks]Show worked answer →
A Paper 1 extended item assessing AO2 and AO3. Markers reward a balanced discussion, not a definition. Award marks for benefits: just-in-time (JIT) delivers parts to the line only as they are needed, so the factory holds almost no stock, which frees up cash and warehouse space, cuts the cost of storing and insuring inventory, and exposes quality problems quickly because there is no buffer to hide them. Award marks for risks: with no buffer stock, any disruption (a supplier failure, a transport delay, a strike) halts the whole line, so JIT depends on reliable suppliers and good communication. Award marks for the link: JIT is one tool within lean manufacturing, whose aim is to eliminate all waste (excess stock, waiting, defects, overproduction); reducing inventory to near zero is a direct attack on the waste of holding stock. A top answer concludes that JIT delivers large savings but transfers risk onto supply-chain reliability.
AQA 20214 marksExplain the difference between quality control and quality assurance in manufacturing. [4 marks]Show worked answer →
A short-answer item. The common error is to treat the two as the same. Award marks for: quality control (QC) is checking the product, inspecting and testing finished or part-finished items against a standard (using gauges, templates and measurement) and rejecting those that fail, so it catches faults after they happen; quality assurance (QA) is a system of documented procedures designed to prevent faults from occurring in the first place, building quality into every stage so that defects are unlikely, which reduces waste and reliance on inspection. Full marks need the inspect-and-reject (QC) versus prevent-by-system (QA) distinction, ideally with the point that QA reduces the need for QC.
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