The 550 adolescents commiting homicides or another grave agressive-violent crimes against personality were examined by complex clinical psychopathological, pathopsychological and instrumental diagnostical methods. A middle age of the patients -16,8.

In 37,3% of the patients organic personality disorders, in 35,4%- schizophrenia spectrum, in 21,3% - pathological formation of a character; in 6% -other nosological states were diagnosed. 67% of adolescents were the social orphans, severe relationships in families were authentic in 55% of cases, 32% were socially desadaptated, 56% revealed the risk of total desadaptation. In 58,5% of the sample different variants of abnormal mental development were presented.

An algorithm of estimation of agressive violent behaviour among the children and adolescents means a carrying out of complex phsychologo-psychiatric investigation in view of clinical psychopathological and psychological estimation of formation of agression in ontogenesis; dynamics of age development of crisis periods; the analysis of psychological, social and clinical components of agressive dehaviour, social functioning, estimation of behaviour and motivation of criminally significant period at fulfilment of socially dangerous act; analysis and synthesis of an expert research, instrumental diagnostic data with a formulation and substantiation of the expert judgement on criminal case (the proof of conclusions of expertise).