Operationalized Psychodynamic Diagnosis (OPD) is a form of multiaxial diagnostic and classification system based on psychodynamic principles, analogous to those based on other principles such as DSM-IV and ICD-10. The OPD is based on five axes: I = experience of illness and prerequisites for treatment, II = interpersonal relations, III = conflict, IV = structure, and V = mental and psychosomatic disorders (in line with Chapter V (F) of the ICD-10). After an initial interview lasting 1-2 hours, the clinician (or researcher) can evaluate the patient's psychodynamics according to these axes and enter them in the checklists and evaluation forms provided. The new version, OPD-2, has been developed from a purely diagnostic system to include a set of tools and procedures for treatment planning and for measuring change, as well as for determining the appropriate main focuses of treatment and developing appropriate treatment strategies.