This paper describes the structure and impacts of a development project in Nagaland, India. The project was a large-scale experiment in participatory development that emphasised local technology based on farmer-led testing of agroforestry, where farmers themselves select agroforestry technologies, implement the field tests and assume responsibility for disseminating the results locally. This assessment suggests that agroforestry has spread rapidly and been primarily adopted on land that otherwise would have been used by traditional farmers for swidden agriculture.