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IBM Rational Software Architect Designer (RSAD and formerly RSA) is a comprehensive design, modeling, and development tool for end-to-end software delivery. It uses the Unified Modeling Language (UML) for designing enterprise Java applications and web services. Rational Software Architect Designer is built on the Eclipse open-source software framework and is extensible with a variety of Eclipse plugins. You can also enhance functionality for your specific requirements with separately purchased Rational extensions.