This chapter introduces the User Requirements Notation (URN) standardized formal methods and its joint use with Unified Modeling Language (UML) in enterprise modeling. It argues that the joint use of URN and UML can enhance enterprise models and co-evolve with enterprise engineering processes. URN combines goals and scenarios to help reasoning and to capture user requirements prior to detailed design. Furthermore, URN can be integrated partially or entirely into an existing business process modeling approach, without replace current ways of creating and analyzing models in order to be useful. Modelled in the UML, a URN model may be incorporated into the rest of a system’s UML design documentation, seamlessly linking the documentation for the requirements elicitation part of a project to the whole and an be fully integrated with the rest of the design documentation for a software system.