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The widespread acceptance of a "participatory" approach is in part due to his work.  This includes the techniques of participatory rural appraisal , some of which he developed himself or with others. In his later career, there were criticisms of their use, and he questioned whether his unabashed populism had ignored tokenistic manipulation of participatory methods: his experience with larger organisations like the World Bank were not positive.  His last research area has been Community-Led Total Sanitation , developed by Kamal Kar to halt open defecation practices.