In this paper we introduce inherent problems of information logistics in health care. Promising research results on agentbased systems have allowed us to conclude that this approach is especially suitable to coping with these problems. In order to adequately capture the requirements of a complex setting, we present an approach for the design of agent-based systems. The basis forms the ethnography-based requirements analysis approach Needs Driven Approach (NDA). The NDA supports the participating observation of work processes and guides the construction of domain models. As a result of a field study, a Technische Universitat Munchen meta-model is constructed which reflects the interrelationships of its elements. According to basic ideas of the Model Driven Architecture (MDA), the elements of the meta-model are mapped to constructs of software engineering.