QA-customer complaint handling or customer service QE-quality engineer (can be divided into DQE-development quality engineer/PQE-process quality engineer) SQE-supplier management (some are also called SQA engineers) IPQC-process inspection IQC incoming inspection FQC-warehousing inspection OQC-delivery inspection (some companies of FQC and OQC will be merged into one unit called FQC or OQC) The basic organizational structure of quality assurance of no company is above. Some of them are perfect as follows: QIT-copy inspection tools or direct maintenance management (such as calipers) /5S audit QS-document management and audit (mainly ISO)- responsible for issuing documents (such as engineering drawings, inspection standards, work instructions, etc. )