This presentation deals with Czech data from ISRD-2 analysing items concerning gang membership and it questions the appropriateness of Eurogang's definition of a gang member. A respondent's direct identification of his group as a gang is to be discussed further.
From the methodological point of view, attention is also paid to the issue of a gang delinquency. By dividing respondents into several groups and by applying Versatility Index in further analysis, several explorative types of gangs are proposed.