Quality assurance and quality control: importance and functions
Quality assurance prevents defects by managing the whole system; quality control detects defects by inspecting and testing the product.
Introduction
Quality is the degree to which a food meets the needs of the consumer and the requirements of the law and the company. Quality assurance (QA) is the set of planned and systematic activities that give confidence that a food will meet these requirements: approved suppliers, GMP, HACCP, trained staff, audits and records. Quality control (QC) is the set of operational techniques (inspection, sampling and testing) used to check that the product actually meets its specifications. QC is one part of QA, and QA is one part of quality management.
QA vs QC
A good company needs both: QA builds quality in; QC checks that it is there.
Importance of quality assurance and quality control
- Consumer: safe, wholesome food of consistent quality and honest quantity.
- Manufacturer: fewer rejects and recalls, lower cost, customer loyalty, protection in law.
- Government: easier enforcement, fewer outbreaks, better public health.
- Trade and export: certificates (HACCP, ISO 22000, FSSC 22000) open new markets.
- Employees: clear procedures, training and responsibility build skill and morale.
Functions of quality control
| Function | What is done | Example |
|---|---|---|
| Set standards and specifications | Fix limits for raw materials, process and product, at least as strict as the law | Moisture in wheat atta within the legal limit |
| Raw material control | Inspect and test incoming lots; accept or reject; rate suppliers | Platform tests on milk; colour and moisture of sugar |
| Process control | In-line checks of time, temperature, pH, Brix and weight; adjust the process | Brix of jam during boiling; oil temperature in a fryer |
| Finished product control | Chemical, microbial and sensory tests; label and net weight checks | Coliform test on ice cream; seal check on milk pouches |
| Packaging and storage control | Check packing material, storage temperature, FIFO and pest control | Cold room temperature log for paneer |
| Sanitation control | Check cleaning of plant and personal hygiene; swab tests | Swab test on cutting boards |
| Records, analysis and corrective action | Keep records, use control charts, handle complaints and recalls | Tracing a complaint batch by its batch code |
| Training and development | Train staff; support new products and shelf-life studies | Shelf-life study of a new millet cookie |
In a hospital diet kitchen, QA is the written system (approved suppliers, standard recipes, hygiene rules) and QC is the daily check: weighing therapeutic portions, tasting, and checking the temperature of food on the trolley before it reaches the ward.
2 marks: “Define quality assurance.” Planned and systematic activities that give confidence that a food will meet its quality requirements. It is preventive and covers the whole system.
5 marks: “Distinguish between quality assurance and quality control.” Definitions; preventive vs detective; process vs product; everyone vs the QC laboratory; tools of each; one example each; both are needed.
10 marks: “Explain the importance and functions of quality control in the food industry.” Define QA and QC; importance to consumer, manufacturer, government, trade and employees; functions: standards, raw material, process, finished product, packaging and storage, sanitation, records, training, each with an example; close.
QA = Prevent (process, everyone). QC = Detect (product, laboratory). Functions of QC follow the food: Standards → Raw material → Process → Finished product → Pack and store → Records.