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Problem-solving methods provide reusable architectures and components for implementing the reasoning part of knowledge-based systems. The Unified Problem-solving Method description Language UPML has been developed to describe and implement such architectures and components to facilitate their semiautomatic reuse and adaptation. In a nutshell, UPML is a framework for developing knowledge-intensive reasoning systems based on libraries of generic problem-solving components. The paper describes the components and adapters, architectural constraints, development guidelines, and tools provided by UPML. UPML is developed as part of the IBROW project; which provides an internet-based brokering service for reusing problem-solving methods. 1. IBROW started with a preliminary phase under the 4th European Framework and has become a full-fledged Information Society Technologies (IST) project under the 5th European Framework Program since January 2000. Results of its initial phase are described in [

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