Thehighestincidenceforclinicaldepressionsisduringadolescence.Furthermore,mentalhealthillnessesthatrecuroverthelife-coursebegininyoungpeople.70%ofallmentalhealthemergebeforethirtyyearsofage.Almostallinterventionsforyoungpeoplehavebeenfirstdevelopedforandtargetedatadults.Hereforthefirsttimeisatalkingtherapy(BPI),thathasbeendevelopedfor,andwith,adolescents.Afterthirtyyearsofclinicalexperiencewithmentallyilladolescentsandtwomajorrandomisedcontrolledtrialsoftreatment,theauthorsrevealabriefpsychosocialinterventionthatisaseffectiveasCBTforadolescentswithdepressionwithandwithoutcomorbidanxietyandconductdisorder.BPIcanbetaughttomentalhealthpractitionersinsixteenhoursandtheycanimmediatelystartdeliveryofcare.Afterasix-monthsupervision,newBPIpractitionersofferanevidencebasedandNICEapprovedtreatmentintheirusualclinicalpractice.