J-PAL's policy group works with governments, NGOs, international development organizations, foundations and donors to help them determine the most cost-effective ways to achieve certain outcomes in the fields of health, education, governance, environment, agriculture, labor markets, and finance (see Policy Lessons). The group also partners with these organizations to scale-up and massively expand the programs that are found to be effective.

Many programs evaluated by J-PAL and found to be highly effective have been scaled-up by governments and NGOs around the world. In addition to this, J-PAL's research has contributed significantly to the policy debate around many programs and policies. More information about some of these scale-ups and policy debates is provided below.