The paper examines the method of operationalisation of the gang definition in ISRD-2 and proposes a possibility of its revision. The new delinquency indicator is created to replace original questions verifying a delinquent character of a gang and allow us to divide data into two analyzed groups of respondents: gang members and potential gang members.
Subsequent searching for factors that predict gang membership and discriminate between the analyzed groups could be starting point in enlarging gang definition, but also a challenge for detailed analysis of selected countries and its potential clustering.