This paper presents an approach to describe business process in production systems using workflow concepts. This work presents an approach to model workflow applications based on the C-Wf model and UML (Unified Modeling Language) Activity Diagrams. The C-Wf model represents the structural and functional enterprise objects involved in the business processes, such as enterprise activities, human resources, machine resources, etc. Through the C-Wf reference model classes it is possible to build up particular enterprise models that involve the elements required to the production planning process and the basic information for monitoring business processes execution under a workflow point of view. The UML Activity Diagrams displays a sequence of activities including execution alternatives and the involved objects in performing the work. This diagram could de used to describe the workflow of a business process, defining the objects related with the enterprise activities.