Introduction -- Description and Evaluation of Approaches to the Classification of Chronic Pain -- The Possibilities for Classification within the Internationally Accepted Diagnosis Key ICD (see also DSM for Chapter V (F)) -- IASP-Taxonomy -- Headache Classification of the HIS -- The Multiaxial Pain Classification MASK of the DGSS -- The Multiaxial Pain Classification - Somatic Dimension (MASK-S) -- The Multiaxial Pain Classification - Psychosocial Dimension (MASK-P).-The Multiaxial Pain Classification - Psychosocial Dimension -- (MASK-P): Theoretical Background, General Guidelines and Operationalization of the Axse -- Theoretical Background -- The Behavioural Theory Basis -- Depth Psychology Basis -- System Theoretical Basis -- General Guidelines -- Restrictions of the MASK-P - Codes Relating to Psychopathological Disorders as classified by ICD / DSM -- Operationalization and the Awarding of Codes -- Axis Supplementary code -- Time Supplementary Code MASK-P - Rating Form Diagnostic Axis 11: MASK-P-Diagnoses -- MASK-P - Diagnosis- and Rating Form -- Training Implications -- Deriving the Therapeutic Indications -- Combining with ICD and DSM / Examples of Applications -- MASK-P - Operationalisations -- Motor Behavioural Strategies for Coping with Pain -- Emotional Coping Strategies for Pain -- Cognitive Coping Strategies for Pain -- Illness Related Metacognition -- Current Stressors -- Trauma / Stress in Life-History -- Habitual Personal Features -- Maladaptive Coping Strategies.-Psychophysiological Dysregulation -- Coping Styles for Conflict -- MASK-P - Diagnosen: Functional Connections -- Literature List -- Tables.