Abstract
The aim of this viewpoint paper is to consider different psychological transdiagnostic processes that can inform the development of effective early intervention approaches in youth mental health before threshold diagnosis is attained. A transdiagnostic process is defined as a mechanism which is present across different disorders and is either a risk or a maintaining factor for the disorder. We consulted the literature with respect to processes across depression, anxiety and eating disorders. We suggest 38 unique transdiagnostic psychological processes. Each were defined to make them suitable for stakeholder consultation (e.g. people with lived experience) in developing transdiagnostic processes (targets) for youth early interventions. We recommend that the definitions of these processes are further developed in consultation with stakeholders, and that systematic reviews are conducted to further identify psychological processes that can inform essential ingredients of interventions that can then be tested for clinical impact in early intervention with youth.