This dissertation is the report of twenty years of practical experiments in HBO (higher vocational education) that were intended to not only provide students with knowledge about and insight in sustainable development, but also the skills and attitude to actually do something with those at a later stage. Roorda focused on various programmes and several aspects of sustainability and worked mainly with teachers, administrators and managers. One of the experiments concerned the development of ‘AISHE’, an assessment and policy instrument for sustainable development in HBO. AISHE is now used in seven countries; on the basis of AISHE the ‘Quality Mark Sustainable Higher Education’ was granted to over fifty programmes and schools. Each experiment used the change processes that took place at that time in HBO, among which a transition from teacher oriented to student- and competence-oriented education. Therefore, the dissertation also presents a historic overview of twenty years HBO history.