Old program code creates technical debt and makes it difficult to maintain robust applications. In this session, we will discuss what refactoring is and how it is important to creating applications that are robust and "bulletproof." We will show an example of rewriting an old monolithic program in a new modular style, and explain the different aspects of it and how it allows for better testing and quality assurance. This is a joint session between programming expert Scott Klement and software testing expert Yvonne Enselman, allowing you to see refactoring from both a tester and programmer perspective. Although some RPG examples are provided, the concepts apply to any software coded in any environment.