The challenge of extending full access to social security coverage to all those who have a right to it is an issue across all branches of social security, and permeates all institutions to various degrees. These guidelines identify administrative solutions to improve access to contributory social security programmes for populations that are difficult to cover; the so-called hard to reach. Consistent with its strategic vision of Dynamic Social Security, the International Social Security Association (ISSA) promotes the extension of social security coverage through a number of measures, including the ISSA Strategy for the Extension of Social Security Coverage, the publication of ISSA handbooks on coverage extension to self-employed and migrant workers, and special studies on the extension of social security coverage, such as the report on the BRICS countries and the Framework Guidance Document on social security for migrant workers in Eurasia.