5. Limitations

We realise that the limit for full generalisation of research findings is that the research sample was not a random sample. The participation of the students in adolescent age in the research was voluntary. On the other side we administrated research methods in 18 high schools in all regions of Slovakia and only 3 addressed students did not participate in the research. The limit for the in-depth analysis of descriptive indicators of our research is that research methods are used experimentally in Slovakia and there are no relevant norms for the Slovak population of adolescents. On the other hand we find out good reliability of used research methods.
