Research Design

We can randomize the allocation of an entire program...We can randomize different components of a program...We can design our evaluation to precisely test a theoretical concept that economists have worried about for years or to test a contentious policy question. In other words, we can tailor the evaluation to answer exactly the question we need to have answered. – Rachel Glennerster and Kudzai Takavarasha, Running Randomized Evaluations: A Practical Guide.