A system to make sure that a product or service meets standards of excellence, and that the process by which the product or service is created is efficient and effective as well. The three key components of this system are quality control, quality assurance and quality improvement.
Quality control (QC) is a process by which entities review the quality of all factors involved in production.
Quality assurance (QA) is a way of preventing mistakes and defects in manufactured products and avoiding problems when delivering products or services to customers.
Quality improvement (QI) consists of systematic and continuous actions that lead to measurable improvement in services and the quality of targeted product and services