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In mechanical design area,large numbers of existing parts can be reused to facilitate new designs.Therefore,an effective reusability assessment mechanism on computer-aided design (CAD) models is required,which can help designers to locate reusable designs quickly.A desired feature to support such a reuse-facilitated mechanism is to push reusability information to designers who are creating new parts.In this way,designers can find out potentially reusable designs when sketching,without creating duplicates.This paper proposes a content-based reusability mechanism that supports retrieval and reuse of parametric mechanical designs.To assess model reusability,design semantics of mechanical parts are normalized and analyzed.Based on the analysis results,models are simplified to remove geometrically insignificant details.In the design stage,when a designer is sketching a simple query that represents early design intents,the proposed mechanism compares the sketch against pre-simplified parts stored in the design repository.These parts,which are similar to the current sketch model and thus indicating reasonable reusability,will be retrieved from the repository and presented to the designer.The proposed mechanism is realized in a prototype platform based on a commercial CAD system and the preliminary results show that the approach proposed is promising.