Matching Assessment and Treatment for Children With Disruptive Behaviour and Their Parents

Inclusion Criteria: * Child is borderline/clinically at risk on the Child Behaviour Checklist (CBCL) or Teacher Report Form (TRF) (T-score greater than or equal to 60 on Externalizing Problems composite scale or a T-score greater than or equal to 65 on the Oppositional Defiant Disorder and/or Conduct Disorder scales) * Child has clinically severe impairment in the interpersonal relations (greater than 3), functioning in schoolwork (greater than 3), or total domains (greater than 15) on the Columbia Impairment scale. * Parent is able and willing to participate in a group treatment Exclusion Criteria: * Child has an ongoing query or diagnosis of Pervasive Developmental Disorder or Autism or Asperger's Disorder * Evidence of cognitive delays or an intellectual disability (based on the Kauffman Brief Intelligence Test-2 (KBIT-2), verbal and/or IQ composite standard score below 80 or collateral information) * Child behaviour or emotional functioning that make group participation not possible * Child preference for individual treatment. * Parent behaviour or emotional functioning that make group participation not possible * Parent preference for individual treatment.