This paper provides a model (Graz Model for Integrative Development) for the assessment of sustainability processes in regards to their transformative potential. The model describes Leadership, Social Networks, Participation, Education & Learning as well as Research Integration as basic principles for transformative development. Interrelations between those principles are being described, demonstrating an approach on sustainability processes from an integrative viewpoint. In an empirical part, modes of assessment in the course of two case studies are being demonstrated. In discussion, three propositions are opening the floor for further research and development of the model, as well as theories and practices of sustainability process assessment. The paper thereby contributes to process assessment, stakeholder interaction and sustainability literature.