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Quadrant Q4 includes performance, load, stress and scalability testing, security testing and other types of non-functional testing that Gregory and Crispin call quality attributes or ‘-ility’ testing in their books, meaning testing quality attributes such as maintainability, portability and interoperability, as well as tests for memory management, recovery, data migration and infrastructure. These tests find non-functional defects that are related to the different quality attributes. They are often quite technical in nature and may require the use of additional tools. The tester involved is typically quite technical, being either a developer or a tester specialised in these testing types. These tests are a...