Definition: Big up-front testing (BUFT) is the approach of trying to test everything in a test lab before release, including attempts to simulate the full production environment. It contrasts with up-front testing (UFT) done in the right amount, followed by testing in production. Beyond a certain point, extra up-front testing gives diminishing returns.
So what? Labs can never fully reproduce real users and data centres, so heavy pre-release testing costs more for less value. Naming BUFT helps teams discuss where to stop testing up front and what to test in production instead.
Examples: A team spending weeks building a lab copy of its production network, only to miss failures caused by real user behaviour. A team deciding which scenarios are well tested in the lab and which are better checked in production.
