Think tanks are institutions or organizations that are affiliated with universities, governments, advocacy groups, foundations, non-governmental organizations, and businesses that generate public policy research, analysis, and activity. (Harvard Kennedy School, Library & Knowledge Services)
Research and advocacy institutes are often known as "think tanks". A think tank is an organization that conducts research and advocates in areas such as social policy. Think tank reports are another useful way to pursue research on policy issues.
Here are a few selected national think tanks/research institutes that work in areas relevant to social welfare: