''Invisible social security'' is a term coined by Jos Berghman in his early work to draw attention to those aspects of social security that easily tend to be neglected in an instrumental perspective that conceives of social security merely as a particular set of instruments that national welfare states deploy to guarantee basic living standards to their citizens. Among others, Berghman emphasised that social security should rather be conceptualised in a situational sense, that is, as a state of being in which citizens feel confident about themselves and about their future lives. This book, Invisible Social Security Revisited, is a collection of essays published at the occasion of the retirement of Jos Berghman as Professor of Social Policy at KU Leuven - University of Leuven. Taking the notion of ''invisible social security'' as a point of reference, nearly thirty years after it was coined, the authors address a series of contemporary issues in social security research and policy-making. One can read about social protection in the past and in the future, about prevention and activation, about European and local policies, about poverty and social exclusion, about feelings of insecurity and failing protection of informal workers, about social values in relation to social policies, and so on. The wide range of issues that are thus covered goes to show that over the years the concept of ''invisible social security'' has retained its academic appeal, as well as its significance for the conceptual and empirical understanding of social security policies and realities. Taken together, the essays provide the reader with up-to-date and innovative ideas and information on important questions regarding the social protection of citizens. This Liber Amicorum for Jos Berghman is published at the occasion of his retirement as Professor of Social Policy at the Centre for Sociological Research of the KU Leuven - University of Leuven, 1 October 2014.