Quality assurance (QA)
Quality assurance is a way of preventing mistakes or defects in manufactured products and avoiding problems when delivering solution or services to customer which ISO 9000 defines as “part of quality management focused on providing confidence that quality requirements will be fulfilled”.
This defect prevention in quality assurance differs subtly from defect detection and rejection in quality control, and has been referred to as a shift left as it focuses on quality earlier in the process. QA applied to physical products in production to verify what will be made meets specifications and requirements, and during manufacturing production runs by validating lot samples meet specified quality controls.
Quality assurance comprises administrative and procedural activities implement in a quality system so that requirements and goals for a product, service or activity will be fulfilled. It is the systematic measurement, comparison with a standard, monitoring processes and associated feedback loop that confers error prevention. This can be contrasted with quality control, which is focused on process output.
QA includes management of the quality of raw materials, assemblies, products and components, services related to production, and management, production and inspection processes.