Political sustainability - which refers to the continuity and commitment of policies and strategies by key actors, and, financial sustainability - which refers to the adequacy resource flows to guarantee the continuity of the expected outcomes of the policy (Mokate, 2001). The analysis of efficiency, in Section 3.2, examines how well available resources are being used. In both sections, the focus is on the government-funded sector of the Peruvian health system, that is, the Seguro Integral de Salud (SIS). Inefficiencies put the financial sustainability of the system at risk, while political instability can also lead to inefficiency, if governments close programmes implemented in a different administration, for example, or use programmes for political gain.