Testing and Implicit Requirements: Expanding the Unwritten Specification

Testers should be encouraged to test against and report deviations from implicit specifications. There is a Universal Implicit Specification that is based on
fundamental principles. These principles are: the system will not lie, the system will impose no gratuitous keyholes or other constraints, and the system won’t do anything that’s just plain stupid.It’s worthwhile to identify, elaborate, and make explicit the fundamental principles and
common manifestations of deviations from these principles.