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Health Policy and Systems Research is concerned with how policies are developed and implemented and the influence of the policy actors have over policy outcomes. It therefore addresses the politics of health systems and health system strengthening. It requires a multidisplinary approach rather than a particular disciplinary base or set of methods. It also includes consideration of global and international issues as well as national and regional issues. This is because global forces and agencies have important influences over health systems in low and middle income countries.