IPQC (process quality control)

FQC (final quality control)

Output quality control

QA: Quality assurance, quality assurance, through the establishment and maintenance of quality management system to ensure product quality without problems. Generally, it includes system engineer, SQE (supplier quality engineer), CTS (customer technical service personnel), 6sigma engineer, calibration and management of measuring instruments, etc. QA should not only know where the problems are, but also know how to formulate solutions to these problems and how to prevent them in the future. QC should know that it only controls the problem, but it doesn't necessarily know why it should be controlled like this.

To make an inappropriate analogy, QC is a policeman and QA is a judge. QC only needs to arrest people who break the law, but it can't stop others from committing crimes and finally convict others. Judges only make laws to prevent crimes and decide the results according to the laws.

QC: It mainly focuses on the quality inspection activities afterwards, and the default error is allowed. We expect to find and choose mistakes. QA is mainly a quality assurance activity in advance, focusing on prevention, hoping to reduce the probability of mistakes.

QC is the operation technology and activities to make products meet the quality requirements, including inspection, correction and feedback. For example, after QC inspection, defective products are found, and then the bad information is fed back to relevant departments to take improvement measures. Therefore, the control scope of QC is mainly within the factory, and its purpose is to prevent the unqualified products from being put into production, transferred out of order and leaving the factory, and to ensure that the products meet the quality requirements, and only qualified products can be delivered to customers.

The purpose of QA is not to ensure product quality, but to ensure product quality is the task of QC. QA is mainly to provide assurance, so it is necessary to manage the whole process from understanding the customer's needs to after-sales service, which requires enterprises to establish a quality control system, formulate corresponding documents to standardize the activities of each process and leave evidence of the implementation of the activities in order to provide trust.