The Child Behaviour Checklist (CBCL) is a widely used caregiver report form identifying problem behavior in children (section: Mental health). It is used in both research and clinical practice with youths. It has been translated into more than 90 languages, including Dutch, and normative data are available integrating information from multiple societies.
Because a core set of the items have been included in every version of the CBCL since the 1980s, it provides a meter stick for measuring whether amounts of behavior problems have changed over time or across societies. This is a helpful complement to other approaches for looking at rates of mental-health issues, as the definitions of disorders have changed repeatedly over the same time frame.

Within Lifelines, the slightly revised version of the 2001 designated CBCL6/18 has been used for children between 8-17 years old at assessment 1A, and for children between 4-12 years old at assessment 2A.
Note that Lifelines has also implemented the self-report version of the CBCL for older children (13-17 years old): the Youth Self-Report (YSR).