Part I. Differential diagnosis step by step -- Part II. Differential diagnosis by the trees -- Part III. Differential diagnosis by the tables -- Neurodevelopmental disorders -- Schizophrenia spectrum and other psychotic disorders -- Bipolar and related disorders -- Depressive disorders -- Anxiety disorders -- Obsessive-compulsive and related disorders -- Trauma- and Stressor-related disorders -- Dissociative disorders -- Somatic symptom and related disorders -- Feeding and eating disorders -- Sleep-wake disorders -- Sexual dysfunctions -- Gender dysphoria -- Disruptive, impulse-control, and conduct disorders -- Substance-related and addictive disorders -- Neurocognitive disorders -- Personality disorders -- Paraphilic disorders