ISO 9000 definitions the QC is the operational techniques and activities that are utilized to fulfil requirements for quality and QA is all those planned and systematic activities implemented to provide adequate confidence that the entity will fulfil requirements for quality. QC is a production line function. The aim of QC is to offer the highest reasonable quality of product or service to the client, thereby meeting or even exceeding the client’s requirements. The QA manager is interested in investigating technologies and processes that prevent defects. QA is a staff function. The aim of QA is to apply a planned and systematic production process, establishing confidence that the process generates suitable products.
QC method is intended to provide regular product inspection, thereby guaranteeing the output’s correctness, completeness, and integrity. It finds and addresses mistakes. They file and record all the QC procedures. The product or service needs to be suitable and fit for the intended purpose. The methods and processes should decrease errors and shortcomings the first time through the manufacturing process. QC is product-oriented; it focuses on tests and inspections carried out at various production line checkpoints. QA is process-oriented; its concerns are process definitions, proper selection of tools, proper use of testing methods, and operator training. QC works at locating defects; QA works at preventing them. QC emphasizes testing of products to discover defects, and reporting the results to management. QA attempts to improve and stabilize production to minimize or prevent the conditions that trigger defects. Typically, quality control involves problem identification, problem analysis, problem correction, and feedback. Quality assurance involves data collection, problem trend analysis, process identification, process analysis and process improvement.