In Use Case Driven Object Modeling with UML, Stephens outlines an extension to the ICONIX object modeling process which he and co-author Doug Rosenberg termed Design Driven Testing (DDT), a deliberate reversal of Test Driven Development (TDD), a core tenet of XP.
ICONIX |
DDT and the ICONIX modeling process have been adopted in a variety of large-scale software projects e.g. the image processing software in the Large Synoptic Survey Telescope (LSST).