The paper presents the findings of research into the implementation and use of Geographic Information Systems (GIS) in Italian local authority planning departments. The first part provides contextual information and available data on the diffusion of GIS in Italian local government. This is followed by a discussion of two detailed case-studies undertaken in cities already having 10 years experience in GIS development and use. Based on the findings of these case-studies, and on the earlier evidence presented, the paper suggests that the view of GIS as a “tool” for more rational decision-making, and increased efficiency and effectiveness, may be particularly inappropriate in countries in which these values do not receive high priority. Instead, GIS appears to be a malleable resource able to serve different agendas, through both its technical and symbolic use. In this context, the view of computing as a “package” appears to be useful in explaining some of the characteristics of the cases investigated. Three sets of factors are confirmed as having an important influence on the implementation and use of GIS: the organizational context, people, and environmental stability. In addition, the paper argues that a fourth element, cultural values, plays an important part in shaping the implementation and use of GIS in a given context, and that its significance may be crucial in understanding the experiences of GIS in different countries even when technical solutions are similar.