Recent focus on early detection and intervention in psychosis has renewed interest in the psychopathological delineation and assessment of psychotic phenomena.These phenomena express a fundamental qualitative change of the patient's mentality (consciousness, subjectivity) which often surfaces already during the prodromal/at risk mental states and is typically manifested across several psycho-behavioral domains (i.e. subjective experience, expression, cognition, affectivity, behavior, and willing). This interactive workshop will offer a clinical introduction into the basic semiology of psychosis, combining descriptive, clinical and structural-phenomenological approaches in psychopathology.