This article considers the implications of theory and research in developme
ntal psychopathology for existing and emerging social policy concerning tre
atment of child and adolescent psychopathology. Based on the concept that a
ll psychopathology is a process, four core principles of a developmental ps
ychopathology perspective are discussed. In turn, each is applied to an eva
luation of policy issues with implications for intervention, including ment
al health parity, treatment guidelines, mental health reimbursement, and le
vel of intervention. It is concluded that social policy on treatment must b
e based on an empirically supported theory of developmental psychopathology
and on evidence-based interventions that link treatments to pathogenic pro
cesses.