Product-Service Systems (PSSs) are regarded as an attractive business concept for manufacturing companies to enhance the value of their products. For designing an effective PSS, it is important to search for value provision opportunities in the entire product life cycle and offer appropriate services to customers at each opportunity. Because both products and services are included in the design object, PSS designers need to use a broader range of knowledge compared with that required in product design. This study proposes a knowledge management method to support designers in the conceptual design phase of PSS. The effectiveness of the proposed method is demonstrated by application to an example of PSS design.

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