: Case-based diagnosis handling multiple faults is still a challenging task. In this paper we present methods for handling multiple faults, embedded in the standard CBR cycle. The approaches extend it by case decomposition and combination strategies which generate candidate cases for case reuse. The context of our work is to supplement a medical documentation and consultation system by CBR techniques which facilitate the extended retrieval of experiences for experience management. We present an evaluation of our approaches with a real-world case base.