Devised by Thomas Achenbach and colleagues at the University of Vermont US, the Child Behavior Checklist (CBCL) provides a standardized method for assessing 20 areas of children’s competency and functioning and provides an indication of their mental health. The checklist can be completed by children, parent, teachers of other professionals. It has strong reliability and validity and norm data exist for US children. It has been translated into several languages and used around the world.