Following the success of the Operationalized Psychodynamic Diagnosis for Adults (OPD-2), this multiaxial diagnostic and classification system based on psychodynamic principles has now been adapted for children and adolescents by combining psychodynamic, developmental, and clinical psychiatric perspectives. The OPDCA2 is based on four axes that are aligned with the new dimensional approach in the DSM5: I = interpersonal relations, II = conflict, III = structure, and IV = prerequisites for treatment. After an initial interview, the clinician (or researcher) can evaluate the patients psychodynamics according to these axes to get a comprehensive psychodynamic view of the patient. Easytouse checklists and evaluation forms are provided. The set of tools and procedures the OPDCA2 manual provides have been widely used for assessing indications for therapy, treatment planning, and measuring change, as well as providing information for parental work.