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Public policy is the principled guide to action taken by the administrative executive branches of the state with regard to a class of issues, in a manner consistent with law and institutional customs. The foundation of public policy is composed of national constitutional laws and regulations. Further substrates include both judicial interpretations and regulations which are generally authorized by legislation. Public policy is considered strong when it solves problems efficiently and effectively, serves justice, supports governmental institutions and policies, and encourages active citizenship. 
Other scholars define public policy as a system of "courses of action, regulatory measures, laws, and funding priorities concerning a given topic promulgated by a governmental entity or its representatives." Public policy is commonly embodied in "constitutions, legislative acts, and judicial decisions. "
In the United States, this concept refers not only to the result of policies, but more broadly to the decision-making and analysis of governmental decisions. As an academic discipline, public policy is studied by professors and students at public policy schools of major universities throughout the country. The U.S. professional association of public policy practitioners, researchers, scholars, and students is the Association for Public Policy Analysis and Management.
Government actions and process Public policy making can be characterized as a dynamic, complex, and interactive system through which public problems are identified and countered by creating new public policy or by reforming existing public policy. 
Public problems can originate in endless ways and require different policy responses (such as regulations, subsidies, Import quota|quotas, and laws) on the local, national, or international level. 
Public policy making is a continuous process that has many feedback loops. Verification and program evaluation are essential to the functioning of this system. 
The public problems that influence public policy making can be of economic, social, or political nature. 
Each system is influenced by different public problems and issues, and has different stakeholders; as such, each requires different public policy. 
In public policy making, numerous individuals, corporations, non-profit organizations and interest groups compete and collaborate to influence policymakers to act in a particular way.
The large set of actors in the public policy process, such as politicians, civil servants, lobbyists, domain experts, and industry or sector representatives, use a variety of tactics and tools to advance their aims, including advocating their positions publicly, attempting to educate supporters and opponents, and mobilizing allies on a particular issue. 
Many actors can be important in the public policy process, but government officials ultimately choose public policy in response to the public issue or problem at hand. In doing so, government officials are expected to meet public sector ethics and take the needs of all project stakeholder|stakeholders into account. 
Since societies have changed in the past decades, the public policy making system changed too. In the 2010s, public policy making is increasingly goal-oriented, aiming for measurable results and goals, and decision-centric, focusing on decisions that must be taken immediately. 
Furthermore, mass communications and technological changes such as the widespread availability of the Internet have caused the public policy system to become more complex and interconnected.  The changes pose new challenges to the current public policy systems and pressures leaders to evolve to remain effective and efficient. 
As an academic discipline, public policy brings in elements of many social science fields and concepts, including economics, sociology, political economy, program evaluation, policy analysis, and public management, all as applied to problems of governmental administration, management, and operations. At the same time, the study of public policy is distinct from political science or economics, in its focus on the application of theory to practice. While the majority of public policy degrees are master's degree and doctoral degrees, there are several universities also offer undergraduate education in public policy.
Traditionally, the academic field of public policy focused on domestic policy. However, the wave of economic globalization which occurred in the late 20th and early 21st centuries created a need for a subset of public policy that focuses on global governance, especially as it relates to issues that transcend national borders such as climate change, terrorism, nuclear proliferation, and economic development. Consequently, many traditional public policy schools had to tweak their curricula to adjust to this new policy landscape, as well as developed whole new ones. Citation needed|date=November 2013
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