133 -  . The Application of GIS to flint management studies during the Pleistocene to Holocene transition: the case of Baltzola (Dima, Bizkaia, Spain) Maite García-Rojas, 1-2 Alejandro Prieto, 2 Aitor Sánchez, 2 Cristina Camarero 2 and Lydia Zapata (†) 2 Introduction Over the course of the last decade, archaeological studies involving Geographic Information Systems (GIS) have increased greatly in the context of the Iberian Peninsula. At the same time, there has been an emphasis on the research of lithic raw materials and the understanding the catchment areas of lithic resources; with all of this being entangled with the articulation of economical territories and patterns of mobility of Palaeolithic groups (Terradas 2002; Mangado 2006; Djidjian 2009). Overall, these studies suppose an advance in the accurate location and petrological characterisation of flint catchment sources in many geographic areas of the Iberian Peninsula (Sarabia 2000; Bustillo and Peréz-Jiménez 2005; Mangado 2005; Tarriño 2006; Tarriño et al. 2015; Fuertes-Prieto et al. 2014; Sánchez de la Torre 2015; Molina Hernández 2015). Despite the multiple applications offered by GIS, Cost Distance Analysis among them, they have barely been used to explore the correlation between flint outcrops and sites. Furthermore, the majority of researchers still 1 Dipartimento di Studi Umanistici Sezione di Scienze Preistoriche e Antropologiche. Universita di Ferrara. 2 Departamento de Geografía, Prehistoria y Arqueología. Área de Prehistoria. Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU).