There are a large number of think tanks and research organizations with a focus on domestic and foreign policy issues. These organizations are often supported by contracts from the government, foundations, private businesses and endowments. Think tanks, in the most traditional sense, are seen as non-partisan organizations, which employ interdisciplinary approaches to finding long-term solutions to policy-related issues. There are many variations in the perspectives and focus of these research organizations: some may be viewed more as advocacy groups that promote a particular agenda; others may resemble private sector consulting organizations or academic institutions. In addition to their research efforts, many research institutes produce major publications or organize professional conferences, lectures and policy forums. Think tank scholars testify before congressional committees, submit articles to major newspapers and may serve on government task forces.