process model, value chain model, REA, production planning, activity diagram, sequence diagram

Business process models represent the flow of operations inside the company generally based on a sequence approach. The value chain (business value) perspective illustrates the value flows among process participants inside and outside of the company and abstracts from the order in which operations occur. Both perspectives should meet at the task level what seems rather difficult. This paper describes the value chain approach based on Resource - Event- Agent (REA) approach and discusses possible ways how to connect both perspectives taking the value chain perspective as the starting point.