 The second category in the public health ethics literature also focuses on the goals and targets of public health policies and programs but from the standpoint of the legitimacy or authority of the State to implement measures that promote or protect public health. (See also the entry on  political legitimacy.)  The normative perspective of legitimacy is particularly relevant in public health ethics because public health interventions are typically undertaken by government, and many maintain that various government interventions stand in special need of moral justification. Familiar debates about the tension between individual liberty and the common good or the moral permissibility of paternalistic interventions have traditionally animated this discussion. Others frame the challenges of state legitimacy or authority slightly differently in terms of what governments should do when citizens disagree about values, such as the importance of health – individual or public. Still others object to the framing of the foundations or justifications of public health from the standpoint of legitimacy in the liberal tradition.