This case study summarises the experience and lessons learned of the pilot project that has been implementing by the CITYNET Yokohama Project Office in Japan partnered with the HELP-O, a local Non-Governmental Organization (NGO), to assist in improving the MSWM in Galle City based on the successful experience of Yokohama City, one of environmental model cities in Japan, in achieving a 40% waste reduction target within 5-7 years by making commitments from; citizens to separate waste, business to collect and recycle, and city government to create more sustainable 3R (reduce, reuse and recycle) system with public education.