This chapter describes message catalog and code table files and how they are used in the IBM Cúram Social Program Management application. Cúram message catalogs allow an application to be localized without manipulating hand-crafted code, while Cúram code table files allow an application to use a level of indirection when storing commonly used constants on the database, e.g., Ms., Mr. This chapter introduces message and code table fundamentals, and explains how they can be augmented to produce customized messages and code tables in a Cúram application.