It is generally known, however, that forests provide many additional market and non-market benefits. All the valuation work presented in the present report is based on analysing existing information (as was the case in chapter 3). Much more compelling, however, was the research teams' realization that the Tanzanian Government, through its Ministry of Natural Resources and Tourism, had commissioned a study in 2002 entitled "Resource economic analysis of catchment forest reserves in Tanzania", whose primary objective was to "generate useful information (facts, data and trends) about the total economic value and the role of catchment forests in the national economy".