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Learn what QA stands for in software testing and how it differs from quality control and software testing. Find out the best practices, functions, certifications and models for QA. Quality Assurance (QA) and Quality control (QC) are both important methods in software engineering to get high-quality software. Quality Assurance (QA) prevents software defects or minimizes the number of defects in software before delivery by making sure that proper methods and processes are followed during the software development process. Quality assurance (QA) is the systematic efforts to ensure that products or services meet customer expectations. Learn about the origins, principles, and methods of QA, and how it differs from quality control (QC). Quality Assurance (QA) is any systematic process used to measure and assure the quality of a product or service. QA is part of quality management that focuses on ensuring a desired level of quality in the development, production, or delivery of products and services.