he GIS session entitled 'Go your own least cost path - Spatial technology and archaeological interpretation': as presented at the September 2009, European Association of Archaeologists 15th Annual Meeting in Riva del Garda, Italy. Contents: Preface (P. Verhagen, A. G. Posluschny, A. Danielisova); 1) Incorporating GIS Methodological Approaches in Heritage Management Projects (J. H. Altschul et al); 2) GIS and the Evaluation of Natural and Cultural Sites during the Planning Process. The Eskilstuna Project (W. Bondesson et al); 3) Reconstruction of the Early and Middle Neolithic Settlement Systems in the Upper Dvina Region (NW Russia) (A. Mazurkevich, E. Dolbunova); 4) Pollen and Archaeology in GIS. Theoretical Considerations and Modified Approach Testing (A. Danielisova, P. Pokorny); 5) Following Roman Waterways from a Computer Screen. GIS-based Approaches to the Analysis of Barcino's Aqueducts (H. A. Orengo, d C. Miro i Alaix; 6) Sherds on the Map."