The symposium, “What Was Sustainability?: The Past, Present, and Future of Sustainability in Design and its Education,” March 26-27, 2025 at the Delft University of Technology, will bring together educators and researchers to explore sustainability, as a concept and set of practices, in design and design education. The symposium will focus in part on the experience of TU Delft, with the goal of contextualizing that within larger narratives of Dutch, European, and global design education, as well as of sustainability beyond design. This is a collaboration with IIT Delhi.