… Kyem, Daniel Weiner, with Robert Chambers. PGIS is an evolved form of community mapping, the result of a spontaneous merger of Participatory … Rachel Olson, Julius Muchemi, Mike McCall and Robert Chambers. Tool-based case studies Using Community Information Systems to express … (CIFOR) Technical Centre for Agricultural and Rural Cooperation (CTA) Environmental Research Mapping and Information Systems in Africa (ERMIS …