A version of RUP (RationalUnifiedProcess) which is consistent with the AgileManifesto and practices. Nicknamed dX, which happens to be 'XP' upside down. Described in Chapter 4 of "Object Oriented Analysis and Design With Applications", 2nd ed., Booch/Martin/Newkirk, Addison-Wesley, 1998 - draft online at http://www.objectmentor.com/publications/RUPvsXP.pdf
Also see