Managing quality, supplier relationships, and the flow of goods
✅ Quality control vs assurance🔗 Supply chain management⏱ 18 min📝 3 practice questions
Learning Objectives
By the end of this lesson you will be able to…
Define quality and explain why it matters for business success
Distinguish between quality control and quality assurance
Explain Total Quality Management (TQM) and Kaizen
Describe the supply chain and the role of suppliers
Compare Just-in-Time vs buffer stock strategies
The Basics
What is Quality?
Definition
Quality means a product or service meets or exceeds customer expectations — it is fit for purpose, reliable, and worth the price paid.
Why quality matters
Builds customer loyalty and repeat business
Positive word-of-mouth recommendations
Justifies a premium price
Reduces costly returns and warranty claims
Protects brand reputation
Cost of poor quality
Returns and refunds eat into revenue
Negative reviews damage reputation
Potential legal action under Consumer Rights Act
Rework costs — waste of materials and labour
Loss of repeat customers
Quality Methods
Quality Control vs Quality Assurance
Quality Control (QC)
Inspects finished products to find defects
Checks happen after production is complete
Defective products are rejected or reworked
Reactive approach — problems found too late
Uses sample testing or 100% inspection
Drawback: Wasted materials if defects found late
Quality Assurance (QA)
Builds quality into every stage of production
Checks happen throughout the process
Aims to prevent defects rather than detect them
Proactive approach — everyone responsible for quality
Often includes ISO 9001 certification
Benefit: Fewer defects, less waste, lower long-term costs
Key distinction: QC checks outputs; QA controls processes. QA is generally considered superior as it prevents problems rather than catching them afterwards.
Quality Philosophy
TQM & Kaizen
Total Quality Management (TQM)
Every employee is responsible for quality — not just inspectors
Quality built into company culture and all processes
"Right first time" — aim for zero defects
Customer satisfaction is the ultimate measure
Requires significant cultural change and training
Kaizen (Continuous Improvement)
Japanese word meaning "change for better"
Small, incremental improvements made continuously
All staff at all levels contribute ideas
Reduces waste, improves efficiency gradually over time
Complements both JIT and TQM
Supply Chain
What is a Supply Chain?
Definition
A supply chain is the network of businesses and processes that transform raw materials into finished products and deliver them to the end customer.
Raw MaterialsCotton farm, oil well
→
ManufacturerTextile mill, refinery
→
DistributorWarehouse, logistics
→
RetailerSupermarket, shop
→
ConsumerEnd customer
Exam point: Businesses that control more of the supply chain (vertical integration) can reduce costs and improve quality, but it requires more investment.
Supplier Management
Working with Suppliers
Supplier selection — choose suppliers based on price, reliability, quality, location and ethical standards
Long-term contracts — give both parties stability; supplier can plan production, business gets consistent supply
Multiple suppliers — reduce risk of disruption if one supplier fails, but may lose negotiating power
Single sourcing — one supplier means better relationships and lower prices, but very high dependency risk
Ethical sourcing — increasingly important; consumers and investors scrutinise supply chains for child labour, environmental damage
Stock Management
JIT vs Buffer Stock
Just-in-Time (JIT)
Minimal stock held — arrives exactly when needed
Low storage costs, less working capital tied up
Reduces waste from obsolete stock
Requires very reliable suppliers
Vulnerable to supply disruptions
Buffer Stock
Safety stock held above minimum level
Protects against supplier delays and demand spikes
Higher storage and insurance costs
More cash tied up in inventory
Risk of stock becoming obsolete (perishables, technology)
Practice Question 1 of 3
A biscuit factory inspects every 100th biscuit as it comes off the production line and discards any batch that fails the check. This is an example of:
AQuality assurance — prevention throughout the process
BQuality control — inspection of finished output to detect defects
CKaizen — continuous small improvements
DTQM — zero defects culture across all staff
Correct: B. Inspecting finished products (checking biscuits after production and discarding faulty batches) is quality control — a reactive, end-of-process check. Quality assurance would involve monitoring and controlling quality throughout the entire production process to prevent defects occurring in the first place.
Practice Question 2 of 3
A clothing retailer encourages all warehouse staff to suggest ways to reduce the time it takes to process online orders. Small improvements are tested and, if successful, become standard practice. This best describes:
AQuality control
BBuffer stock management
CKaizen — continuous improvement led by all staff
DJob production
Correct: C. Encouraging all staff to suggest small, ongoing improvements that are tested and adopted is the definition of Kaizen (continuous improvement). It is a key lean production technique originating from Japan. It differs from TQM in that TQM is a broader quality philosophy, while Kaizen focuses specifically on incremental improvement suggestions from all levels of the workforce.
Practice Question 3 of 3
A supermarket uses Just-in-Time stock management for fresh produce. It reduces storage costs but during a heatwave, demand for salad surges unexpectedly. What problem does this illustrate?
AJIT increases the risk of overstocking and waste
BJIT cannot respond quickly to unexpected increases in demand, leading to empty shelves
CJIT only works for manufactured goods, not food
DJIT increases quality but raises storage costs
Correct: B. JIT holds minimal stock, relying on demand predictions to order just enough. When demand unexpectedly spikes (heatwave increases salad demand), there is no buffer stock to cover the surge — shelves go empty and sales are lost. This is the key trade-off: JIT saves money in normal conditions but is fragile when demand is unpredictable.
Key Takeaways
What to Remember
Quality control — checks output after production; reactive
Quality assurance — builds quality into every stage; proactive and preventative
TQM — zero defects culture; every employee responsible for quality
Kaizen — small, continuous improvements suggested by all staff
JIT saves storage costs but is vulnerable to supply disruption; buffer stock is safer but costlier to hold