This article describes the development of the working group GDI-Südhessen from a pilot project to a municipal SDI. Based on the findings of the pilot phase, a legal and organizational form was tested and implemented. Another key objective of the working group is the joint implementation of the INSPIRE Directive. The resulting solution steps are presented. The article concludes with an overview of the two central services of the GDI Südhessen – the GDI InfoTour and the GDI InspireUmsetzer.