Quality management: control, assurance and improvement, TQM, ISO standards, Six Sigma and benchmarking (HSC Business Studies)

What this dot point is asking

In the syllabus, quality management sits under operations strategies as "quality management: control, assurance, improvement". TQM, ISO standards, Six Sigma and benchmarking are the standard examples of these approaches in HSC textbooks and marking guidelines. Quality also links to the "students learn to" point "discuss the balance between cost and quality in operations strategy", and to quality expectations as an influence on operations.

What quality means

Quality is the degree to which a good or service meets customer expectations and specifications: fitness for purpose, reliability, durability, appearance and, for services, responsiveness, accuracy and courtesy. It is one of the six performance objectives.

The costs of quality

Quality management is easier to justify when you can show what poor quality costs. Businesses often group quality costs into four categories:

The key idea: spending more on prevention usually reduces the much larger failure costs. That is the logic behind moving from control to assurance to improvement.

Quality control

Quality control uses inspection and testing to measure outputs against a set standard, then rejects, reworks or scraps those that fail.

• Inspection of finished goods or services (for example checking a vehicle before delivery).
• Sampling and testing: testing a sample from each batch rather than every item, common in food and pharmaceuticals.
• Statistical process control: measuring outputs during production and charting them against tolerance limits, so managers can act when the process drifts before large numbers of defects are made.

Strengths: stops many defective items reaching customers; simple to understand. Limitations: reactive (the defect has already been made, so resources are wasted); inspection costs money and adds no value; defects that slip through still reach customers.

Quality assurance

Quality assurance is a system for making sure that agreed standards are achieved throughout the process, so defects are prevented rather than detected. It relies on documented procedures, trained staff, internal audits, management review and corrective action. Many businesses have their system certified by an independent body against an international standard.

ISO standards

The International Organization for Standardization (ISO) publishes standards used worldwide.

• ISO 9001 sets requirements for a quality management system: a customer focus, leadership commitment, a process approach, evidence-based decisions, managing risks and continual improvement. Certification tells customers and business buyers that the system meets the standard; many large customers and government buyers require it from suppliers.
• ISO 13485 applies these principles to medical devices.
• ISO 14001 covers environmental management systems.
• ISO 45001 covers work health and safety management systems (in Australia it replaced the older AS/NZS 4801 standard).

Example: Cochlear. Cochlear, the Sydney-based maker of cochlear implants, operates a quality management system designed to meet ISO 13485 and the requirements of regulators such as the US Food and Drug Administration. Implants stay in the body for many years, so defects are unacceptable; quality assurance (design controls, supplier qualification, documented manufacturing and post-market monitoring) is central to its operations. Its Nucleus Nexa implant, approved by the FDA in July 2025, includes onboard diagnostics, extending quality monitoring to the device itself after implantation.

Strengths of quality assurance: prevents defects, lowering failure costs; certification opens markets and builds trust. Limitations: documentation and audit costs; it can become a paperwork exercise if staff do not follow the procedures in practice.

Quality improvement

Quality improvement is the ongoing effort to raise the standard over time. The main approaches are:

Total quality management (TQM)

TQM is a management philosophy in which every employee and every function is responsible for quality, with the aim of continually meeting or exceeding customer expectations. Its main features:

1. Customer focus: quality is defined by what customers value.
2. Continuous improvement: small, ongoing improvements to every process.
3. Employee empowerment and teamwork: staff closest to the work are trained and authorised to solve problems; quality circles meet to find improvements.
4. Benchmarking: comparing against the best to set targets.
5. Zero defects and "right first time": prevention over inspection.
6. Supplier partnerships: long-term relationships with suppliers who meet quality standards.

Continuous improvement (kaizen)

Continuous improvement is an ongoing commitment to making small, incremental improvements to processes, products and services. In the Toyota Production System it is called kaizen. A common method is the Plan-Do-Check-Act (PDCA) cycle: plan a change, try it, check the results, and standardise it if it works.

Example: the Toyota Production System. Toyota combines jidoka (stopping production when an abnormality is detected, including an andon system that lets workers signal a problem and halt the line) with kaizen. Problems are fixed at the source, which prevents defects being passed along the line. It is the standard example of quality built into the process.

Six Sigma

Six Sigma is a data-driven method for reducing variation and defects in a process, targeting no more than 3.4 defects per million opportunities. Projects follow the DMAIC cycle: Define the problem, Measure current performance, Analyse the causes, Improve the process, and Control it so the gains last. It originated at Motorola in the 1980s and was popularised by General Electric. It suits repetitive, measurable processes such as manufacturing, claims processing and call centres, and is often combined with Lean (eliminating waste such as waiting, overproduction, excess inventory, unnecessary movement and defects) as Lean Six Sigma.

Benchmarking

Benchmarking is comparing the business's processes and results with those of the best performers, then adopting better practices.

• Internal benchmarking: comparing branches, stores or plants within the business.
• Competitive benchmarking: comparing with direct competitors (for example airlines comparing on-time performance, which the Bureau of Infrastructure and Transport Research Economics publishes monthly).
• Functional or best-practice benchmarking: comparing a function (such as logistics or customer service) with the best in any industry.

When quality systems fail

Two verified Australian cases show the external failure costs that quality management is designed to prevent.

Goods: the Takata airbag recall. Following an ACCC safety investigation, the federal government issued a compulsory recall on 27 February 2018 for vehicles with defective Takata airbags, which the ACCC describes as the most significant compulsory recall in Australia's history, covering more than three million vehicles and over four million airbag inflators. The airbags had a design defect that could cause them to deploy with too much force and fire metal fragments at occupants. The case shows the scale of external failure costs when a supplier's defect enters many manufacturers' products, and why vehicle makers audit supplier quality.

Services: the 2025 Optus Triple Zero outage. On 18 September 2025, a firewall upgrade at an Optus exchange blocked emergency Triple Zero calls for about 13 hours in parts of South Australia, Western Australia, the Northern Territory and New South Wales. About 600 emergency calls failed, and four deaths were linked to the outage. Reporting and the independent review commissioned by Optus identified failures to follow change procedures, gaps in monitoring and slow escalation of warnings. In quality terms, this was a failure of quality assurance (procedures not followed, monitoring that did not cover a critical service) with catastrophic external failure costs.

A worked numerical example

A hypothetical manufacturer makes 100,000 units a quarter with a defect rate of 1 per cent, or 1,000 defective units. If each defect costs $200 in warranty replacement, handling and freight, failure costs are $200,000 a quarter.

A Six Sigma project costing $100,000 cuts the defect rate to 0.1 per cent. Defects fall to 100 a quarter, costing $20,000, a saving of $180,000 a quarter or $720,000 a year. The project pays for itself within the first quarter, before counting the value of fewer unhappy customers.

How this dot point appears in the HSC

• Section I: identify whether a scenario shows quality control, assurance or improvement, or which technique (benchmarking, TQM) is being used.
• Section II: distinguish the three approaches, or explain how one improves operations (3 to 6 marks).
• Section III: recommend quality strategies for a business with high defect rates, complaints or returns in the stimulus.
• Section IV: evaluate quality management as part of operations strategy, linked to the cost-quality balance and competitive advantage.