For the implementation of a mobility survey among more than 50,000 people nationwide, we again decided to go with OnYourMap. They developed a GIS application specifically tailored to our requirements with numerous interfaces to external databases (incl. partly automatic updating) and applications as well as an intuitive user interface for use in our telephone labs. In addition to the close contact with direct access to competent specialists, the long-standing cooperation with OnYourMap is characterised for us by cost transparency and efficient collaboration on common goals.