Organizational concepts, like virtual enterprises or profit centers in companies, are ordering new functionality on information systems. Enterprises have to customize their business processes in very short periods because of stronger competition and globalization. Concepts like electronic commerce and supply chain management need a permanent optimization of the business processes along the supply chain. The generating of individual software and model based customizing of ERP-packages offer potentials for more flexibility supporting business processes with information systems. This paper shows a concept for describing and implementing business processes and a software development project using this concept.