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This paper presents an Assembly Design (AsD) ontology that explicitly represents AsD constraints and infers any remaining implicit ones. By relating concepts through ontology technology rather than just defining data syntax, assembly and joining concepts can be captured in their entirety or extended as necessary. Ontologies allow assembly and joining constraints to be represented in a standard manner regardless of geometry file formats. Such representation will significantly improve service-oriented design collaboration. The developed AsD ontology is tested using a realistic mechanical assembly and it is shown how the ontology can be used to capture design rationale and analyze the design intents. In conclusion, the significance of ontology for realizing lean and selective assembly design information sharing is discussed.

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