Researchers agree about how a specific economic sector impacts on a local economy (range of activities, phases of production, number of hired people (direct, indirect, and induced), the methodologies or the categorizations used to measure this impact are multiple. Especially in developing countries, the pro-poor impact of tourism can strongly vary from one methodology to another. The period of time allocated to collect and sometimes to analyze the information is evidently a stringent factor of accuracy. Therefore, the analysis of the identical area leads sometimes to a different result/understanding which in return can influence in the choice of more or less economically and socially efficient strategies. This work will first present different approaches and methodologies used in South East Asia to measure the local and pro-poor impacts of tourism. Then, we propose a framework for tourism stakeholders to assess and maximize the development impact of public/private investments in the tourism sector, especially the pro poor impact.