Saúde e Sociedade presents, in this new issue, the always polemic and actual theme of Social Security and its complex relationships involving the notion (and the practice) of the public, the private, the state, the social, in health within us in those new liberal days. The relevance of putting again this theme in debate, and the contribution of different authors can be observed in the Special Editorial written by Professor José da Rocha Carvalheiro, our Guest Editor.

Besides this main theme, other relevant discussions enrich the present issue.

This is the case of the article by Cláudia Fonseca about the conceptions of family and intervention practices, in an anthropological perspective. The relation between theory and practice also is present in the paper written by Luciane Raupp and Clary Milnitsky-Sapiro about contemporary conceptions and practices of public policies for adolescents. Using as example drug-addiction, the authors discuss the implications of reducing the youths to a "risk category".

The article by Regina Marsiglia, Cássio Silveira and Nivaldo Carneiro Júnior also offers a theoretical discussion about the concepts of public policies, based on the experience of the implementation of the Family Health Program.

Áurea Ianni drives the reader to a rich and complex re-thinking on the relation health and environment, proposing questions for a new approach.

Finally, Saúde e Sociedade brings to the reader, in this issue, a re-presentation of the section "Report of an Experience", where Sarita Amaro discusses the possibilities of new insights and new technologies of prevention in the health services, in face of the growth of HIV among women.

Thus, in face of the diversity of themes and problems that challenge public health, Saúde e Sociedade reinforces its purpose of being a space where authors can deconstruct the idea that "in the practice the theory is another".

Faculdade de Saúde Pública, Universidade de São Paulo. Associação Paulista de Saúde Pública. SP - Brazil
E-mail: saudesoc@usp.br