Abstract
In this paper, we introduce a framework for knowledge reuse and deduction in mechanical products design and development. The proposed system effectively exploits the capitalized and inferred knowledge. To this end, we settled up an ontology dealing with the design process of mechanical products such as "the car". The ontology-based framework is supported by a software tool that brings an automatic and personalized assistance to correspondent actors using the deduction process. Indeed, the systems provides the relevant knowledge to the suitable users in order to facilitate their professional tasks considering their roles and collaboration. Experimental results have demonstrated the effectiveness of reusing knowledge during product development lifecycle.