This paper critically examines the new institutionalism approach to defining and evaluating formal and informal institutions as well as providing policy prescriptions for developing countries with regard to two key challenges. The first challenge is the lack of theoretical consensus on the definition of institutions and, consequently, their extension from formal and ethical rules to executive mechanisms and political and economic institutions. The second challenge is the constraint on the measurement of informal institutions stemming from the characteristics of informal social levels in which institutions appear unplanned. For this reason new institutionalism scholars have largely avoided careful study of informal norms. Conceptual scatteri...