The Great Minster has to meet a wide variety of requirements. Besides its actual purpose as a spiritual meeting place, it is also an accessible landmark affording a generous view, an attraction for those interested in culture and Polke fans from all over the world, as well as an event hall for concerts. Like an instrument that is constantly exposed to different temperatures, it must now be “tuned” in order to create a harmony of the different requirements. We propose a catalogue of measures that can be implemented in modules. After each module, the effect achieved can not only be qualified by means of a scientific analysis procedure, but also quantified. Visitor behaviour, for example, is recorded by temporarily installed cameras and evaluated. The result supports the decision for the respective next step.