On Thursday, September 29th Berdien De Roo succesfully defended her PhD entitled "Putting the past in place. A conceptual data model for a 4D archaeological GIS'. Her research was supervised by Prof. dr. Philippe De Maeyer of the Department of Geography and Prof. dr. Jean Bourgeois of the Department of Archaeology. The thesis examined the requirements for archaeological data storage, analysis and exchange and determines how these can be translated into an archaeological data model. The research is the first step towards a 4D archaeological GIS.