Quality control and quality assurance
Quality means meeting the standard the customer expects, consistently. Quality control means inspecting the finished product and removing the faulty ones before they reach the customer: it is simple and needs little training, but the faults have already been made and paid for, so the waste is built in.
Before you start
Make sure you're comfortable with these topics first:
Method
- Separate the two systems in your definition: control inspects at the end, assurance prevents throughout. Muddling them is the most common lost mark on this topic.
- Apply to the case: a business with high scrap rates or lots of returns has a quality control problem that assurance would address at source.
- Analyse in costs. Rework, scrap, refunds, replacement delivery, warranty claims and lost repeat purchases are all quantifiable, and the exam question usually gives you one of them.
- Recognise the investment side: quality assurance needs training and takes time to embed, and productivity often dips before it improves.
- Link quality to the marketing mix. Consistent quality supports a premium price and a strong brand, so the benefit shows up in revenue as well as in cost.
- For a judgement, weigh the cost of prevention against the cost of failure, and note that the balance shifts with the product: a fault in a food or medical product is not comparable with a fault in a pencil.
Worked example
Ridgeway Electricals makes 12,000 kettles a month. Its final inspection rejects 4 per cent of them, and each rejected kettle costs 9 pounds in wasted materials and labour. A quality assurance programme would cost 3,500 pounds a month in training and checks and is expected to cut the reject rate to 1 per cent. Analyse whether Ridgeway should adopt it.
- Find the current rejects: 4 per cent of 12,000 is 0.04 x 12,000 = 480 kettles a month.
- Find the current cost of failure: 480 x 9 = 4,320 pounds a month.
- Find the rejects after the change: 1 per cent of 12,000 is 120 kettles, costing 120 x 9 = 1,080 pounds a month.
- Compare: the saving in failure cost is 4,320 - 1,080 = 3,240 pounds a month, against a programme cost of 3,500 pounds. On these numbers alone the change loses 260 pounds a month.
- Look past the arithmetic, which is where the higher marks are. The 4 per cent figure counts only the kettles caught by inspection; any faulty kettle that reaches a customer causes a return, a refund, a replacement delivery and possibly a negative review, none of which is in the 9 pounds.
- Add the capacity point: producing 480 kettles that are then scrapped uses machine time and materials that could have produced saleable output, so the true cost includes the lost contribution on those units.
- Reach the judgement: on the stated costs the programme is marginally unprofitable, but it becomes clearly worthwhile once escaped defects and lost production capacity are counted, so Ridgeway should adopt it while negotiating the training cost down or phasing it in on the highest-reject line first.
Practice questions
Try each question, then tap to reveal the answer.
Q1State the difference between quality control and quality assurance.Show answer
Answer: Quality control inspects the finished product and removes faulty items at the end. Quality assurance builds checks into every stage of the process so that faults are prevented from occurring in the first place.
Q2Give three costs to a business of poor quality.Show answer
Answer: Any three of: wasted materials and labour on scrapped items; the cost of reworking faults; refunds and replacements; warranty or repair costs; lost repeat customers; damage to reputation through reviews and word of mouth.
Q3A business makes 8,000 units a month and rejects 2.5 per cent. Calculate the number rejected.Show answer
Answer: 0.025 x 8,000 = 200 units.
Q4Explain one benefit of making each worker responsible for checking their own work.Show answer
Answer: A fault is caught at the stage it occurs rather than after further value has been added to a product that will be scrapped, so less material and labour is wasted, and the worker gets immediate feedback and can correct the cause.
Q5What is continuous improvement, and why does it depend on employees?Show answer
Answer: Making many small ongoing improvements to a process rather than one large change. It depends on employees because the people doing a job daily see the small inefficiencies that managers do not, so the system only works if their suggestions are genuinely used.
Q6Explain why quality matters more for a business selling online than for a market stall.Show answer
Answer: Online customers cannot inspect the product before buying, so they rely on reviews. A quality failure becomes a permanent public rating that affects every future customer, whereas a market stall's reputation is local and less durable.
Q7Give one reason a business might advertise an external quality standard such as ISO certification.Show answer
Answer: It is independent proof of a consistent process, which reassures business customers who cannot inspect production themselves and is often a requirement for winning contracts with large firms or the public sector.
Exam-style questions
Written in the style of a GCSE Business exam paper, with a full mark scheme.
Selby Sauces produces 30,000 jars a month. Currently 3 per cent are rejected at final inspection, at a cost of 1.20 pounds a jar. A further 0.5 per cent of total output reaches customers faulty, and each of those costs 6 pounds in refunds and replacement postage. (a) Calculate the total monthly cost of poor quality. (b) Analyse one benefit and one drawback of Selby introducing quality assurance instead of final inspection.
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Evaluate whether investing in quality is always worthwhile for a small business.
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See real GCSE Business past-paper questions, with official mark schemes →
Free printable worksheet
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