Abstract. For electronic government initiatives to succeed, in addition to modernising the front office, attention should be also paid in order to streamline, reorganise and support the back-office processes of public administrations that provide public services to citizens. Furthermore, actions should be taken to limit the loss of critical knowledge assets during the life cycle of electronic government services. In this paper, the OntoGov project is outlined aiming to develop, test and validate a semantically-enriched (ontology-enabled) platform that will facilitate the consistent composition, re-configuration and evolution of electronic government services.