A geographic information infrastructure (GII) develops gradually. Several development stages may be identified each with unique characteristics. Also the organisational characteristics are likely to vary per stage. This knowledge was used to develop an SDI maturity matrix as presented by Kok and Van Loenen (2005), further developed in Van Loenen (2006). Although the model has been subject of study of several Master students and has been successfully applied in several case studies, it is still in its early development stages. This paper further develops the model by including the cultural dimension as presented by Hofstede (1980). The paper draws on the research accomplished by and presented in Huisman van Zijp (2008).