This research project aims to measure and monitor the impacts of tourism on residents in the Algarve. Firstly, it will identify indicators, related to residents, which should be measured for the sustainable tourism development of the region. Secondly, it will quantify these indicators, by collecting data in the 16 municipalities of Algarve, in both high and low seasons. Thirdly, it will build a digital platform that will allow the interested stakeholders easily access the collected information, and closely accompany the effects of tourism in the visited regions. Besides its practical relevance, the project is theoretically innovative. It will validate a set of scales about the relationships residents-tourism-tourists, in a consolidated destination, as the Algarve. The project will also allow advancing knowledge in models to predict the relationships among residents’ attitudes towards tourism and behaviors, pro-tourism and pro-tourists.