 Child Well-Being: Evolution of a Notion, Ambiguities of Dimensions and Measures 
Research Framework : This article is reviewing the international literature on determinants and measures of child well-being and secondary analysis of some of the main international database in order to identify some unexplained mechanisms. Objectives : It formulates hypotheses to explain the gaps between the level of public and social investment in policies addressed to children and the level of their subjective well-being. Methodology : This research is based on a literature review and secondary analysis of international databases. Results : The article insists on the quality of communication between parents and adolescents in the level of subjective well-being Conclusions : More qualitative research is needed to understand the mechanisms in cause. Contribution : This paper is based on the activities of the chair CNAF-EHESP “Childhood, well-being and parenting” which question the current focus on well-being and happiness in order to better appreciate and understand its conditions by social scientists.