QC is the abbreviation of English Quality control, which means quality control in Chinese. Its definition in ISO 9000: 2000 is: "Part of quality management, dedicated to meeting quality requirements." All organizations that implement ISO9000 will generally set up such a special department to be responsible for the quality control functions required by ISO9000 international standards. The personnel in this department are called QC personnel, and some companies are called quality inspectors. At least they must have the qualification of quality internal auditors.

QA is the abbreviation of English Quality assurance, and Chinese means quality assurance. Its definition in ISO 9000: 2000 is: "A part of quality management, dedicated to providing trust that quality requirements will be met." All organizations that implement ISO9000 will generally set up such a special department to be responsible for the quality assurance function required by ISO9000 international standards. The personnel in this department are called QA personnel, and some companies are called quality engineers. At least they must have the qualification of quality internal auditors.