"Less seems to be known about software testing than about any other aspect of software development."
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Software Development Engineer in Test (SDET) is a hybrid of a software tester and a developer to automate the testing itself. The title and acronym originated from Microsoft in 2005. Apple and Amazon also use the SDET job title; while Google prefers SET (software engineer in test) for a similar role.
Quality Assurance (QA) is a way of preventing mistakes or defects in manufactured products and avoiding problems when delivering solutions or services to customers; which ISO 9000 defines as "part of quality management focused on providing confidence that quality requirements will be fulfilled".