ARC Seibersdorf Research GmbH and Medexter Computersysteme have signed a cooperative agreement concerning the development and marketing of Rheumexpert. Rheumexpert is a medical expert system to support differential diagnosis in rheumatology, to be used by general practitioners. Based on Medexter's knowledge base and inference mechanisms for Rheumexpert, ARC Seibersdorf will develop the software program and connect it to medical practice software systems.