Background
Youthful aggression, perceived both as a social phenomenon and a psychological issue, is the subject matter of numerous theoretical analyses and scientific studies. Usually, their aim is to determine the consequences of aggressive behaviour, especially the development of criminal behaviour. However, empirical studies devoted to the relations between aggressive behaviour of Polish youth and intrapersonal factors are still lacking. The main aim of the research presented in this paper was to determine the relationship between attachment, temperament, aggressiveness and aggressive behaviour among young people. For research purposes, the multidimensional aggression model developed by Anderson and Bushman was used.

Participants and procedure
Measurements were carried out with the Buss-Perry Aggressiveness Scale, the Parent and Peer Attachment Inventory by Armsden and Greenberg, the Buss and Plomin Temperament Scale and the Mini DIA Questionnaire (Österman and Björqvist). The studied group consisted of 120 young persons aged between 16 and 19.

Results
The research results support the conclusion that the dominant temperamental component of persons characterized by a high level of aggressiveness is anger. Also, correlations were found indicating that a high level of trust and a high level of alienation in the relationship with the mother are connected with anger as an aggressiveness component.

Conclusions
The actually undertaken aggressive behaviour depends on the prevailing aggressiveness dimension: the frequency of perpetrator-type behaviour increases along with the general aggressiveness level and the frequency of its manifestation in the form of physical and verbal aggression, while the frequency of victim-type behaviour increases along with the experienced level of anger and hostility.