​Public policy is a discipline that explores the role and impact of decision-making by governments. The discipline includes knowledge of both process and substance of a particular policy area. Thus, a student in public policy must have both generalist and specialist skills to apply to a particular public problem. In terms of political process, the study of public policy examines questions of how public policy is formulated, implemented, and evaluated over time. It also explores notions of agenda-setting and framing of issues that lead to a problem gaining the attention of the government. Public policy specialists and analysts are hired by all levels of government.