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Quality assurance (QA) is a part of a bigger function called Quality Management together with Quality planning (QP), Quality control (QC, Quality surveillance (QS) and Quality improvement (QI).

Quality assurance is the activity of providing confidence to customers, users and all those concerned, that quality related requirements will be fulfilled. QA refers to all those planned or systematic actions necessary to provide adequate confidence that a product or service will satisfy given requirements for quality. QA is, sometimes, overlapping with quality control and quality surveillance. It differs from Quality control (QC) which covers the operational techniques and activities that focus on controlling the processes and materials to fulfill requirements for quality. It differs from Quality surveillance which is involved in the continuing monitoring and verification of the status of procedures, products and services, and analysis of records in reloation to stated refernces for quality to be met.