In dictionaries:
test-driven development
(software engineering) A software development process that relies on the repetition of a minimal development cycle where the developer writes an (initially failing) automated test case that defines a desired function, then produces minimal code to pass that test, and finally refactors the new code to acceptable standards.
Acceptance test-driven development
Acceptance test–driven development is a development methodology based on communication between the business customers, the developers, and the testers.
more...