Integrating sustainability into an undergraduate engineering program at the University of Technology, Sydney has been a challenging project. The authors of this paper have been participant observers of the integration process. In this paper, they have attempted an analysis of that process, focussing on the dynamics of the network of people and interests, which have shaped the process. Actor network theory was used to provide an analytical framework for the analysis. The interests and experiences of the authors in the process necessarily influence the analysis. All three authors have been active in positioning sustainability as a central theme for the critique and practice of engineering. Paul Bryce and Stephen Johnston have had long-standing involvement in technology transfer projects in development. Both have published on engineering as a social activity, critiquing the undue emphasis in engineering education on engineering science, at the expense of attention to engineering practice. Their experience and scholarship have given credibility to their efforts in the faculty to press for a new paradigm of engineering practice. Keiko Yasukawa is an educational developer in the faculty who has been working with staff and students to help them reflect on their idea of what engineering is about in their teaching and learning. She has taken a leading role in shaping the new curriculum.