The Doi Tung Development Project (DTDP) started in 1988, covering approximately 15,000 hectares of the Doi Tung area, in the Golden Triangle, a major region of opium production, impacting 11,000 people in 29 villages. This mountainous watershed area had been subject to slash-and-burn cultivation, opium cultivation, and trafficking of both human and arms. The project aimed to resolve problems faced by locals, from lack of health care, education, and governmental support, over a span of 30 years (1988-2017), in three phases: