The authors focus especially on the role background characteristics such as gender, immigrant background and family structure and causal mechanisms such as risky lifestyles and low self-control as many scholars have argued that the correlation between offending and victimization may be caused by common characteristics of offenders and victims. The article build upon two large-scale self-reported delinquency studies in Sint-Niklaas (Belgium) and Halmstad (Sweden). The correlation between offending and victimization is strong, even when controlling for demographics, lifestyles and low self-control. However, the lifestyle and low self-control model predicts offending better than victimization and the independent effect of offending on victimization is larger than the independent effect of victimization of offending. The same pattern is found in both samples, suggesting the stability of findings. The implications of these findings are discussed. (Published Abstract)