Before revision:  First, we design a short pilot study with few clusters for testing whether base-line interventions are welfare-maximizing, with its rejection motivating larger-scale experimentation .
After revision:  First, we design a short pilot study with few clusters to test whether there exists a welfare-improving treatment configuration and hence worth learning by conducting a larger scale experiment. We propose a practical test that uses information on the marginal effect of the policy on welfare to compare the base-line interventions are welfare-maximizing, with its rejection motivating larger-scale experimentation .