Title of the thesis: Ontology and Knowledge Graph-Based Data Management for Sustainable Buildings: A Case of Digital Product Passport to Enable Circular Economy in the Built Environment Author of the thesis: Rahel Kebede Third-cycle subject area: Machine Design Faculty examiner / Opponent: Associate Professor Pieter Pauwels, Eindhoven University of Technology, Netherlands Principal supervisor: AssociateProfessor Peter Johansson JTH, Jönköping University