The goal of the present Master’s Thesis is to develop a learning tutorial for Lisboa Quantum GIS v.1.8.0 Geographic Information System. The resulting document is intended as a learning tool. This document should be useful to those people who wish to acquire basic skills in the use of Quantum GIS and, at the same time, should provide the user with a picture of what Geographic Information Systems (GIS) are. The skills that this tutorial aims to teach are how to locate and download useful information to work with GIS, to create vectorial Shape files and work with them, manage, make queries, and select tabulated and graphic information, as well as to represent graphically the results through the creation of maps. The document will make use of real data downloaded from different sources, with the intention of doing the proper operations to simulate a real making-decision process as its leading topic. The subject chosen is related to the optimal location to set air bases (heliports) within Catalonia to fight forest fires in protected areas of Natura Network.