There are various kinds of knowledge in CPC(Collaborative Product Commerce) environment. If we can share and integrate these kinds of knowledge, we can expect to achieve many results such as saving costs and reducing time for the product development. In this paper, we suggest a conceptual ontology model for sharing and integrating product knowledge and validate it through applying in CPC project. The ontology model consists of Common Vocabulary Layer, Ontology Layer, Knowledge Instance Layer, and Information Source Layer. The ontology model is the scheme for representing the product knowledge. Through sharing and integrating the product knowledge, the model also make it possible to expand the knowledge.

Key Words : Ontology, Product, Knowledge, sharing, integration, CPC,