Quality control and quality assurance

Quality assurance is building quality into the production process at every stage (1) so that defects are prevented rather than just detected at the end (1).

One reason quality is important is that it builds the firm's reputation and customer loyalty. When a product reliably meets customers' expectations, they trust the brand, buy again and recommend it to others. This increases repeat sales and can reduce the marketing cost of attracting new customers, supporting long-term revenue.

Quality control means inspecting products, usually at the end of production, to detect and remove faulty items before they reach the customer. It relies on inspectors and is reactive — the defect has already been made, so there is often waste and rework.

Quality assurance is different: it means building quality into every stage of the process so that defects are prevented rather than detected. Each worker takes responsibility for the quality of their own work, and the firm may follow recognised standards.

The key difference is therefore one of detection versus prevention: control catches faults at the end, while assurance stops them happening throughout the process. As a result, assurance tends to reduce waste over time but costs more to set up and requires a change in workers' attitudes.

Poor quality means the product fails to meet customers' expectations, and this has serious impacts on a business through both its costs and its revenue.

First, poor quality raises costs. Defective items must be scrapped or reworked, wasting materials and labour, and may have to be recalled or replaced under warranty. If faults reach customers, the business faces returns, refunds and complaints to handle. These extra costs reduce profit margins and can be significant in a manufacturer with high output.

Second, poor quality damages revenue through reputation. Customers who receive faulty goods are unlikely to buy again and may tell others or post negative reviews, so the business loses repeat custom and finds it harder to attract new customers. A reputation for poor quality can also prevent the firm from charging a premium price or winning contracts with business customers who demand quality standards. Over time this can shrink market share.

These two effects reinforce each other: rising costs and falling sales squeeze profit from both sides. The severity depends on the type of business — for a firm competing on quality or brand, the reputational damage is especially serious, whereas a low-cost producer might survive minor quality issues if price remains its main appeal.

Therefore poor quality is expensive in both money and reputation, which is why businesses invest in methods such as quality assurance and TQM to prevent it.

Introducing TQM could bring the manufacturer important benefits. Under its current quality control, faults are only detected at the end of the line, causing waste, rework and the risk of defects reaching customers. TQM would make every worker responsible for quality and pursue continuous improvement and 'right first time', so faults would be prevented throughout the process. This should reduce waste and rework, lower long-run unit costs, and produce more consistent quality — strengthening the firm's reputation and customer satisfaction as it grows. Giving workers responsibility can also motivate and empower them (a soft-HRM benefit), improving engagement. For a growing manufacturer whose reputation and costs depend heavily on quality, these are exactly the gains it needs.

However, introducing TQM has significant costs and risks. It requires a major culture change: every employee must accept responsibility for quality, which is a big shift from relying on inspectors. This needs extensive training, full commitment from senior management, and time, all of which are costly and disruptive, and may meet resistance from workers and managers used to the old system. The benefits are long-term, so the firm bears heavy short-term costs before seeing results, and a half-hearted implementation would waste money and achieve little. If the firm's quality problems are minor, a less drastic step — moving to quality assurance — might capture much of the benefit at lower cost and risk.

Judgement (criterion). Whether to introduce TQM depends on how central consistent quality is to the firm's competitiveness and whether it can secure full, sustained commitment to the culture change. If quality is a key source of competitive advantage for this growing manufacturer and management is genuinely committed to leading the change, TQM is likely to be worthwhile, because the long-run savings, consistency and reputation gains outweigh the set-up cost. But if commitment is doubtful, the workforce is resistant, or the quality problems are modest, a phased move to quality assurance first would be the safer, more proportionate choice. On balance, given the firm is growing and currently relies only on end-of-line inspection, moving towards TQM is the stronger long-term strategy provided it commits properly and accepts the short-term cost; otherwise it should start with quality assurance.

Competitiveness — a firm's ability to win and keep customers against rivals — can be improved in several ways: quality, price, marketing, innovation, customer service and efficiency. Improving quality is often seen as the key route, but how far that is true depends on the business and its market.

The case that quality is the most important way. Quality, meaning meeting or exceeding customer expectations, directly affects whether customers choose and stay with a business. High, consistent quality builds reputation and loyalty, generating repeat custom and recommendations, and allows the firm to charge a premium price, raising margins. It also lowers costs by reducing waste, rework and returns, so the firm can compete on price too. Methods such as quality assurance and TQM can therefore improve competitiveness from both sides — sales and costs. In markets where customers value reliability and brand, poor quality is fatal, so improving quality can be the single most important driver of competitiveness.

The case that other factors can matter more. First, price can dominate in price-sensitive markets — many customers buy the cheapest acceptable product, so cost efficiency or low prices may matter more than extra quality. Second, innovation and product features can be decisive: a more innovative or up-to-date product can win the market even if a rival's quality is similar. Third, marketing and brand shape what customers perceive and choose, sometimes more than the underlying quality. Fourth, customer service, availability and convenience can be the deciding factor in many markets. Moreover, improving quality has diminishing returns and costs: beyond the level customers expect, extra quality may add cost without winning more sales ('over-engineering'). So quality is necessary but not always sufficient.

Weighing it up (criterion). How important quality is depends on what customers in the firm's market value most and how the firm chooses to compete. In markets where customers prioritise reliability, safety or brand (e.g. cars, food, healthcare), improving quality is likely to be the most important route to competitiveness. In price-driven or fast-moving markets, price, innovation or marketing may matter more, and quality only needs to reach the level customers expect.

Judgement. Improving quality is usually one of the most important ways to increase competitiveness, and often the most important — but not universally so. It is most decisive where customers value quality and where it both wins sales and cuts waste; it matters less where the market competes mainly on price or novelty, or where quality is already 'good enough'. The most defensible conclusion is that quality is the most important route to competitiveness when it matches what the firm's customers value and is achieved without excessive cost, but a business should improve quality alongside price, innovation and marketing rather than treating it as the only lever — the right priority depends on its market and chosen strategy.