There is a video available for Rational Application Developer (RAD) that assists you with downloading installation files. The concept of the video is based on parts of the Rational Application Developer for WebSphere Software 9.0 download document. There are many listed when looking at RAD 9.0 on Passport Advantage. The video provides an overview of what is available in the list of files and what you download depending on your usage of RAD.
Rational Software Architect RealTime Edition- IBM Rational Software Architect is a modeling and development environment that uses the Unified Modeling Language (UML) for designing architecture for C++ and Java 2 Enterprise Edition (J2EE) applications and web services. Rational Software Architect is built on the Eclipse open-source software framework and includes capabilities focused on architectural code analysis, C++, and model-driven development (MDD) with the UML for creating applications and web services.