Public policy is a course of action or inaction chosen by public authorities to address a problem. Public policy is expressed in the body of laws, regulations, decisions and actions of government. Policy analysis may be used to formulate public policy and to evaluate its effectiveness. Many public policy analysts earn public policy degrees like Ph.D., Master of Public Policy and Master of Public Administration in public policy schools, while others earn specialized degrees, such as an M.Ed for specializing in educational policy or an MSW for specializing in social welfare policy.