Can tailored therapy help teens with behavioral issues and intellectual disabilities?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Referral Criteria: * Known or suspected ID of the referred adolescent and/or their parent(s); * Educational level of the referred adolescent and/or highest attained diploma of their parent(s) is indicative of potential ID. Inclusion Criteria Study Sample: * Adolescent must be 10 to 19 years old at the start of treatment; * Adolescent presents with severe behavioural problems in at least two life areas; * Adolescent lives with a family or there is a family the adolescent can live with, in which parent(s) have parental custody for a longer period of time; * Parent(s) consent(s) and is/are willing to engage in treatment to prevent an out-of-home placement of the adolescent; * Adolescent and/or parent(s) have a known or suspected intellectual disability (operationalised as an intelligence quotient \[IQ\] score of between 50-85 and additional deficits in adaptive functioning) * Adolescent and/or parent(s) have sufficient knowledge of the Dutch language (as assessed by a clinician and/or researcher) in order to understand and answer the various (self-report) questionnaires. Exclusion Criteria Study Participation: * Adolescent lives independently; * Adolescent presents with severe problematic sexual behaviours, without presenting with other severe behavioural problems; * Adolescent presents suicidal, psychotic, or homicidal requiring specialised treatment (such as a crisis placement in a residential facility); * Adolescent has a severe Autism Spectrum Disorder (level 2-3 according to the Diagnostic and Statistical Manual of Mental Disorders \[DSM-V\] criteria) or a severe ID (IQ score \<50); * Adolescent has internalising psychiatric problems which are the primary reason for referral, or has serious psychiatric problems (similar to #3 as well as for example eating disorder.