Enterprise modeling is a new area of considerable current interest to chemical processing industries. Similar to the approach of the Process Systems Engineering community, the Enterprise Modeling community attempts to construct models of total systems rather than individual pieces. This paper will examine WHY Enterprise Modeling has caught industry’s attention, continue with an example of how Enterprise Modeling has been applied in a restructuring project at a gas processing plant in Norway, WHAT Enterprise Modeling is, what kind of problems it may be used to address, and finally HOW Enterprise Modeling fits in with our Process Systems Engineering tradition.