Psychotic Symptom Rating Scales (PSYRATS) (Gillian Haddock, McCarron, Tarrier, & Faragher, 1999) is a 17 item interviewer scored instrument which consist of 2 subscales (PSYRATS Voice, PSYRAT Delusion) which measures the severity of a number of dimensions of auditory hallucinations and delusions including the amount and intensity of distress associated with these symptoms. The 11 item hallucination sub-scale consists of items such as frequency, duration, loudness, negative content, intensity of distress and degree of disruption. The six item delusion sub-scale (PSYRATS delusion) consists of items such as amount of pre-occupation, degree of conviction, intensity of distress and disruption. All items are rated on a five point scale of increasing severity (0 = No problem to 4 = Maximum severity). The PSYRATS has demonstrated good inter rater reliability (intra class correlation (ICCS) for most item > .90), test re test reliability (ICCS for both subscales = .70), concurrent validity, and sensitivity to change in patients diagnosed with Schizophrenia.