In my investigation I concentrate specifically on cases of children from three children{\crq}s homes in Italy and Czech republic (Casa del bambino PIO XII., private children{\crq}s home Marketa and Church children{\crq}s home Emanuel). In these homes they use preventative bahaviour system founded by Don Giovanni Bosco who was the Italian priest and educator who lived in the 19 century and he founded the work which was dedicated to the poor young people without their home in Turin.The intention of Don Giovanni Bosco was to help to give the right direction to young people.This system has three basic pillars which are reason, kidness and religion. His system demands from the educator constant presence with the children and education with the example of yourself.The preventative behaviour system of Salesiani and its tradition is worth attention for the the prevention of social {--} pathological phenomena.

The presented work deals with social-pedagogy approaches in the issue-based youth work centres. The first part attends to the analysis of the idea {\clqq}unattached youth``. It takes aspect of the lifestyle sociology, the social education and the developmental psychology. The viewed group of the unattached youth is presented as a group of the adolescents; they have problems with the coping strategies in the post-modern society. The second part of the work takes their problems as a starting-point for the next reflec-tion. It determines criteria of the effective youth work dealing with the unattached youth. Finally the third applied part evaluates the four current types of the issue-based youth work: the German open youth work (Offene Kinder- und Jugendarbeit), the British youth work, the Czech issue-based youth work centres and the Czech open youth centres. The evaluation is focused on the criteria of the effective youth work dealing with the unat-tached youth; we derived in the second part. Overall the main aim of this work is to point out the effective issue-based youth work has to take into account the social and developmental needs of the target group.