This article attempts to present the welfare sociology approach to the problems and dilemmas of modern developed capitalist societies. in addition to describing areas of interest in welfare sociology, primarily welfare economics and positive psychology, the focus will be on the characteristics of the condition of modern societies. For this purpose, the term 'uncertainty', which is well suited for characterizing the various dimensions of post-modern societies, will be used. nevertheless, one should keep in mind that this concept has not reached the creditable sociological elaboration (except for the work of economists on precarious forms of employment). as sociologically defined, welfare will be used for analyzing changes in the structure of social differentiation, as well as in social relationships, educational opportunities, political attitudes, patterns of consumption and leisure, to name a few. all these changes reflect not only the impact of globalization on social security systems, but also the consequences of the technological revolution and demographic challenges on subjectively perceived social welfare.