Rational Developer for i (RDi) is the IDE of choice for editing, verifying, analyzing, and managing RPG, COBOL, and C/C++ on the IBM i (i.e the AS/400). If you come from a SEU/PDM development environment and are looking to move to a robust development environment, or if you wish to use the new RPG language features, you need to read through this to learn how to adopt the product. In this presentation we cover the new features of RDi 9.1, including the new debugger and code coverage tooling. We also demonstrate editing features of the LPEX editor, such as find/replace with regular expressions. We cover the screen and report designers as well.