The articles of this e-book present theoretical considerations, empirical findings and practical experiences from the Lüneberg Sustainable University research and development project. This draws attention to the fact that integrating sustainability into higher education institutions needs theoretical reflection as well as to show that sustainability in higher education can be articulated, substantiated and put into action. The results of this research and development project can serve as a valuable starting point for other higher education institutions which want to begin or progress on the journey towards sustainability.