This report is about the CA for Sustainable Agriculture and Rural Development (CA-SARD) project in Tanzania funded by the German Government and implemented by FAO and the Ministry of Agriculture of the United Republic of Tanzania. The publication describes the experiences of introducing CA as a concept for sustainable crop production intensification in farming communities of Karatu District, Arusha Province, Tanzania. The case study explains the adoption process and shows the impact of CA in terms of agricultural production, environment and ecosystem services, livelihoods and other socio-economic factors. The case study is directed to policy makers, scientists and environmentalists and should help decision making towards sustainable intensification concepts for agriculture.