GIS - Geographical Information Systems - are computer-based techniques for gathering, organising, analysing and presenting geographical information. GIS is based on the fact that spatial aspects of information (that as such can be very complex) can be collected in order for geographical connections and relationships can be studied, thereby increasing the understanding of many historical and archaeological phenomena. Since information from a number of disciplines can be merged, the use of GIS provides good possibilities to integrate humanist and scientific research, and to study general tendencies in developments that may include lengthy chronological depths and extensive geographical distributions.