QA vs QC: Quality Assurance vs Quality Control Explained

What is quality assurance (QA)?

Answer: Quality assurance is the set of planned, systematic activities that ensure a product is built right the first time. QA acts on the process, not the product: written specifications, approved golden samples, documented work instructions, operator training, calibrated machinery, ISO 9001 systems and corrective-action procedures.

Quality assurance is the set of planned, systematic activities that ensure a product is built right the first time. QA acts on the process, not the product: written specifications, approved golden samples, documented work instructions, operator training, calibrated machinery, ISO 9001 systems and corrective-action procedures. QA is proactive and happens before and during manufacturing.

What is quality control (QC)?

Answer: Quality control is the physical verification of finished or in-progress product against a written checklist. A QC inspector pulls a randomised sample, classifies defects as critical, major or minor, and issues a pass, hold or fail verdict against an Acceptable Quality Limit — normally AQL 2.5 for general consumer goods under ISO 2859-1 / ANSI Z1.4.

Quality control is the physical verification of finished or in-progress product against a written checklist. A QC inspector pulls a randomised sample, classifies defects as critical, major or minor, and issues a pass, hold or fail verdict against an Acceptable Quality Limit — normally AQL 2.5 for general consumer goods under ISO 2859-1 / ANSI Z1.4.

QA vs QC in one sentence each

QA asks 'is our process capable of producing a good product?' QC asks 'is this specific batch actually good?' A factory can hold ISO 9001 certification (strong QA) and still ship a defective lot — which is exactly why independent QC inspection exists.

What does QA/QC mean on a job title or scope of work?

Answer: 'QA/QC' as a combined term usually describes a single role or department responsible for both the preventive system and the inspection activity. In export manufacturing, a QA/QC manager writes the control plan, trains line inspectors and signs off the internal inspection report — but international buyers still commission a third-party QC inspection because the factory's QA/QC team is paid by the factory.

'QA/QC' as a combined term usually describes a single role or department responsible for both the preventive system and the inspection activity. In export manufacturing, a QA/QC manager writes the control plan, trains line inspectors and signs off the internal inspection report — but international buyers still commission a third-party QC inspection because the factory's QA/QC team is paid by the factory.

How importers should combine QA and QC

Answer: Run QA activities before the purchase order is signed and QC activities after production starts. The sequence below is what we deploy on every sourcing engagement.

Run QA activities before the purchase order is signed and QC activities after production starts. The sequence below is what we deploy on every sourcing engagement.

Cost of QA vs QC for an import programme

QA is mostly a one-time setup cost per supplier (a factory audit runs $300–$600). QC is a recurring per-shipment cost ($199–$350 per man-day). Both together typically cost under 1% of order value and reduce defect rates from 8–12% to 1–2%.

Side-by-Side Comparison