Step-by-Step: Evaluation of a Stepped Care Model

Inclusion Criteria: * Families with children aged 8-16 years who have difficulty controlling anger or exhibit defiant or aggressive behavior. The child/adolescent meets 3 of the diagnostic criteria for Oppositional Defiant Disorder or 2 criteria for Conduct Disorder indicating aggressive behavior. * Medication for the child can remain stable. * Parents need to be able to read and engage with materials in Swedish Exclusion Criteria: * Families with children younger than 8 years old or who have already turned 17, or who do not exhibit defiant or aggressive behaviors according to the first inclusion criterion. * Children with severe depression, suicidal behavior, bipolar disorder, psychosis, eating disorders, severe autism (level 2 and 3), diagnosed intellectual disability, or ongoing criminal behavior assessed to require interventions other than the study's interventions are excluded. * Children/adolescents with other ongoing psychological treatments for the same condition or assessed by the clinician in need of other interventions * Parents and children with epilepsy or migraines