RADXP is a rapid application development methodology for solutions delivery. RADXP is a focused application of the Rational Unified Process (RUP) and Extreme Programming (XP) to the challenge of delivering Web Services. This methodology enables solutions providers and their customers to control time, scope and costs. The result is a superior solution completed within 90 days.

The RADXP methodology divides a solution delivery into five phases, Requirements, Architecture, Design, eXecution and Production.

Between each phase is a firebreak, a point where the solutions provider provides the customer a deliverable for the customer's approval. For instance, at the end of the first phase, the customer receives a requirements specification for its approval.