In this paper we present a structured methodology for linking data modeling with functional modeling in a computer integrated manufacturing system. We describe our target application, the functional and data models, and a method for developing the data model, starting from the functional model. Our approach ensures that the data model is complete and non-redundant with respect to the functional model. We also present a scheme that enables us to link the various functions in the functional model with the data elements of the data model. Such a linkage makes it possible to determine the impact of a change in the functional model on the data model and vice versa.