Objectives:
The main aim of the research was to establish relations between attachment styles and disorders in adolescent psychosocial functioning. In order to understand how early childhood experiences, parental attitudes and family system can influence emotional and behavioural disorders in adolescence, case study analysis was conducted.

Methods:
Three qualitative methods were applied in this study: content analysis, participant observation and in-depth interview with adolescents, their tutors and members of families.

Results:
In the treatment group, three attachment styles were distinguished: anxious-ambivalent, anxious-avoidant and disorganized. Each type was described in terms of its cognitive, emotional, behavioural and social characteristics. Moreover, each attachment style was related to specific child mental problems and disorders in whole family functioning.

Conclusions:
It seems that negative early attachment experiences are the risk factor for developing serious behavioural, emotional or social problems in adolescence. Rejecting or overly permissive parental attitudes and disorders in family functioning play a crucial role in this process. Furthermore, attachment theory provides not only useful explanations of the problem etiology, but also gives us deep understanding of current symptoms and appropriable proposal for treatment.