dRi applies robust quantitative tools for counterfactual analysis, including Randomized Control Trials (RCT) and Propensity Score Matching (PSM), to determine the efficacy of a program or policy. dRi has established itself as an expert both in Ex Post and Ex Ante impact evaluations. dRi also offers sophisticated qualitative and participatory methods, including Qualitative Longitudinal Research (QLR), Process Documentation Research (PDR) and Ethnography and Participatory Impact Assessment (PIA), to systematically assess our central question- ‘what works for whom and under what conditions?’. Two groups of highly trained and dedicated enumerators and anthropologists work for dRi to collect numerical and qualitative data. Human problems, and the intricacies of development practice, are complex phenomena. Thus, dRi takes an inclusive, multidisciplinary and mixed method approach to understand the complex social dynamics of research problems.