The project Q-KULT, which was financed by the European Comission, has been closed. The project focused on the topic of quality culture in vocational schools. The aim of the project was to make quality culture visible as a key factor in the sustainable implementation and institutional-ization of quality management systems in vocational schools. Accordingly, suitable instruments were developed with which steering opportunities are enabled both at system and provider level for the improvement of sustainable implementation of QM. Central to the project was the devel-opment and testing of a diagnostic instrument to identify school quality culture.