The realisation of e-Government services, in particular in Switzerland, has made limited progress. This is due — on the one hand — to the federal constitution of the Swiss Confederation. On the other hand, public administrations are concerned about the high initial effort and the corresponding financial investments. With the OntoGov system, reference process models are provided at various abstraction layers. Public administrations can adapt these reference models to their specific needs and make them available for citizens. Decisions for designing and adapting reference processes are explicitly modelled using ontologies, thereby making the decision process traceable. Thus, subsequent changes in the reference models can be transferred to all the depending models.