.svg){kind=icon}
If you've seen "QC," "QA," "IQC," "AQL," or "PSI" in a factory report and weren't sure what it meant, you're not alone. This glossary defines every quality control and inspection acronym importers from China and Vietnam are likely to encounter, in plain English, with a full comparison table you can bookmark and refer back to.
In short: If you've seen "QC," "QA," "IQC," "AQL," or "PSI" in a factory report and weren't sure what it meant, you're not alone — Chinese and Vietnamese manufacturing uses a dense shorthand of quality control acronyms that most importers only learn the hard way. This glossary defines every term you're likely to encounter, in plain English, with a full comparison table you can bookmark.
Last updated: August 12, 2026
What Does QC Stand For?
QC stands for Quality Control — the process of inspecting finished or in-progress goods to find defects. QC is reactive: it happens after something has already been made, checking whether it meets the agreed standard.
What Does QA Stand For?
QA stands for Quality Assurance — the processes and systems that prevent defects from happening in the first place, such as approved factory procedures, material checks, and documented standards. QA is proactive; QC is the inspection that follows.
What's the Difference Between QA and QC?
QA prevents problems before production; QC catches problems after. Professional importers use both together rather than choosing one. For a full breakdown with a practical framework for Ireland and UAE importers, see our guide: QA vs QC in Manufacturing.
The Complete Glossary of QC and QA Acronyms
| Acronym | Full Form | What It Means |
|---|---|---|
| QC | Quality Control | Inspecting goods to find defects after they're made |
| QA | Quality Assurance | Processes that prevent defects before production |
| IQC | Incoming Quality Control | Checking raw materials and components as they arrive at the factory |
| IPQC | In-Process Quality Control | Checking products at intervals during production, not just at the end |
| FQC | Final Quality Control | Inspecting finished goods before packing |
| OQC | Outgoing Quality Control | Final check of packed goods immediately before they leave the factory |
| DUPRO | During Production Inspection | On-site inspection when roughly 20–30% of an order is complete |
| PSI | Pre-Shipment Inspection | Third-party inspection of finished, packed goods before loading |
| AQL | Acceptable Quality Limit | The statistical sampling standard used to decide how many units to check and how many defects are allowed |
| CPK | Process Capability Index | A statistical measure of how consistently a production process meets specification |
| DPPM | Defects Per Million | A defect-rate metric used mostly in electronics and high-volume manufacturing |
| CoC | Certificate of Conformance | A supplier document stating the goods meet the agreed specification |
| MTC | Material Test Certificate | A lab document verifying the material used meets specification |
For a deep dive into one specific certification comparison, see our guide on ETL Listed vs UL Listed electrical safety certification.
What Does AQL Mean in an Inspection Report?
AQL (Acceptable Quality Limit) sets how many units an inspector samples from a batch and how many defects are allowed before the whole batch fails. A common standard is AQL 2.5 for major defects and AQL 4.0 for minor ones, but the right level depends on your product and risk tolerance. For the full explanation with worked sampling tables, see our guide: What Is AQL? A Practical Guide for Importers.
What Is a PSI and When Should You Book One?
A Pre-Shipment Inspection (PSI) happens after production is finished and goods are packed, but before the container is loaded. It's the last checkpoint where you can still reject or rework goods without paying for a return shipment. Most importers book a PSI for every order, especially the first order with a new factory. Full walkthrough: Pre-Shipment Inspection in China: The Complete Quality Control Guide.
Frequently Asked Questions
What is the full form of QA and QC?
QA is Quality Assurance and QC is Quality Control. QA is about preventing defects through process controls; QC is about detecting defects through inspection.
What does QAQC mean when written together?
QAQC (or QA/QC) refers to using Quality Assurance and Quality Control together as a combined quality management approach — most professional importers run both rather than relying on inspection alone.
What's the difference between IQC, IPQC, and FQC?
They're the same quality control concept applied at three different stages: IQC checks materials on arrival, IPQC checks products during production, and FQC checks finished goods before packing.
Do I need to understand all these acronyms, or can my agent handle it?
A sourcing agent or QC provider will use this terminology in reports and quotes, so a basic understanding helps you ask the right questions — but you don't need to run the inspections yourself. Most importers rely on their agent or a third-party inspector to execute the actual checks.
Why do Irish importers need to know these terms specifically?
Products sold in Ireland and the wider EU also need to meet CE marking and REACH chemical compliance, which get verified alongside standard QC/QA checks. Understanding both sets of requirements avoids a shipment being held up at Dublin Port over a compliance document that wasn't checked earlier in the process.
How Epic Sourcing Helps
Epic Sourcing runs the full QA/QC process for importers who don't have their own team on the ground — factory audits, DUPRO inspections, pre-shipment inspections, and compliance document checks — with bilingual staff based in China and Vietnam, not a desk-based reporting service. We support importers across Ireland, the USA, Singapore, South Africa, and the UAE. Learn about our quality control and factory audit service or get in touch for a no-pressure conversation.