International Institute for Applied Systems Analysis (IIASA), International Institute for Applied Systems Analysis (IIASA), International Institute for Applied Systems Analysis (IIASA), International Institute for Applied Systems Analysis (IIASA), International Institute for Applied Systems Analysis (IIASA), International Institute for Applied Systems Analysis (IIASA), University of Dar es Salaam, Makerere University, University of Natural Resources and Life Sciences Vienna, Makerere University, Institute of Rural Development Planning (IRDP), Dodoma, University of Burundi, Lake Victoria Basin Commission, Lake Victoria Basin Commission, International Institute for Applied Systems Analysis (IIASA) and International Institute for Applied Systems Analysis (IIASA)