Text in Afrikaans / Die doel van die studie is om die leefwereld van die aggressiewe adolessente seun te verken. Aggressie word beskou as 'n gedragsafwyking wat op fisieke, verbale of passiewe wyses kan manifesteer. Die oorsake van aggressiewe gedragsmanifestasies by die adolessente seun word hoofsaaklik gevind in die ontoereikende gesinsrelasies. Gevoelens van ongeborgenheid, verwardheid en verwerping is dan die gevolg. 'n Onrealisties positiewe of -negatiewe selfkonsep kan hieruit voortvloei en kan daartoe lei dat die aggressiewe adolessente seun betrokke raak by negatiewe portuurrelasies, waar onder andere rook, dwelm- en drankmisbruik asook roekelose gedrag manifesteer. Ult hierdie literatuurbevindinge is twaalf postulate gestel en bespreek. Vyf idiografiese studies is onderneem, waarvan drie volledig bespreek is. Die bevindings uit hierdie studies sluit aan by die feite wat ult die literatuurstudie oor die leefwereld van die aggressiewe adolessente seun verkry is. Vroee uitkenning, ouerleiding en navorsing met betrekking tot hulpprogramme aan terapeute word aanbeveel om aggressiewe gedragsmanlfestasles by die adolessente seun te voorkom / The purpose of this study is to explore the lifeworld of the aggressive adolescent boy. Aggression is regarded as deviant behaviour, that may manifest itself physically, verbally or passively. The causes of aggressive behaviour in the adolescent boy can be due to inadequate family relationships. Feelings of insecurity, confusion and rejection are the results of the problematic relationships. An unrealistic positive or negative self concept may develop that might lead to involvement with the negative peer group. Smoking, alcohol and drug abuse, as well as reckless behaviour may occur. Twelve postulates have been determined and discussed. Five idiographic studies have been done. Three are discussed in detail. Deductions made from these studies are in agreement with findings in existing literature of the life world of the adolescent boy. Early identification parental guidance and research regarding therapeutical programmes are recommended to prevent aggressive behaviour with the adolescent / Psychology of Education / M. Ed. (Spesialisering in Voorligting)