"Sustainability education requires inter- and transdisciplinary approaches that integrate environmental, economic, technical, and social perspectives to address complex societal challenges. This article presents the bachelor’s and master’s programmes in Sustainable Development and Applied Sustainability at Bochum University of Applied Sciences, which combine disciplinary specialisations with transdisciplinary project-based learning involving external stakeholders. Drawing on more than a decade of experience, the article reflects on lessons learnt in designing collaborative learning environments, developing integrative competencies, and linking theory with practice. It also discusses institutional and pedagogical factors that support inter- and transdisciplinary education and outlines possible pathways for future programme development and societal impact."