Inclusion Criteria:  Between 12 and 17 years of age (both inclusive) at trial inclusion. First-episode psychosis within F2 spectrum (F20 schizophrenia, F21 Schizotypal disorder, F22 delusional disorder, F23 acute and transient psychotic disorders, F25 schizoaffective disorders, F28/29 other or un-specified non-organic psychosis) or depression with psychotic symptoms (F32.3, F33.3) or substance-induced psychosis (F1X.5) according to the International Statistical Classification of Diseases and Related Health Problems (ICD-10). Maximum 12 months since first prescription of antipsychotic treatment on the indication psychosis. Speak and understand Danish. Written informed consent from parents or legal caretakers. Participants who reach age 18 years during the trial will be asked to give personal written informed consent to continue their study participation.  Exclusion Criteria:  A diagnosis of mental retardation of at least moderate severity defined as an intelligence quotient (IQ)of 49 or below (F71, F72, F73 according to the International Statistical Classification of Diseases and Related Health Problems (ICD-10). Currently compulsory admission and/or treatment according to Danish legislation