Quality Assurance and Compliance
What the domain covers
Quality assurance (QA) is the system that prevents defects; quality control (QC) is the checking that detects them. Candidates must understand standards and specifications (what "clean" or "secure" means on this contract), audit and inspection methods (scheduled, random, and customer-triggered), sampling and scoring, and corrective and preventive action (CAPA) - fixing the defect and stopping recurrence. Know the difference between a nonconformity (a failure to meet a requirement) and an observation (an improvement opportunity).
Compliance means meeting contractual, legal, and internal requirements: method statements, safe systems of work, chemical handling and COSHH-type controls, PPE, training records, and audit trails. Understand traceability - records must show who did what, when, and to what standard. Know the plan–do–check–act cycle as the backbone of continuous improvement, and root-cause tools such as the "five whys" and cause-and-effect thinking. Recognise that QA is proactive and preventive, while QC is detective.
Traps to watch for
Questions often confuse QA with QC; if the answer describes inspecting finished work, it is QC. Another trap is closing a nonconformity by re-cleaning only - the correct answer also addresses the cause. Watch for answers that hide a compliance failure from the client; transparency and corrective action are expected. Beware of treating a single good audit as proof of sustained quality; trends and repeat findings matter.
Worked example / rule of thumb
An audit finds three of twenty rooms below standard, all cleaned by the same new starter. Rule of thumb: contain, correct, cause, check. Contain (re-clean the rooms), correct (record the nonconformity), cause (the new starter was not signed off on the method), check (retrain, re-audit, and confirm the trend improves).