The paper will tackle several critical elements required for social protection systems and programs to adequately consider disability related extra costs. In the first part, it will explain the diversity of disability related costs. The second part will present current methods to assess and measure disability related costs and the issues they raise. The last part will present how social protection systems can take into account and tackle those different disability related costs. The details of design of cash transfers or in-kind support will be addressed in other papers in this series.