The Clinician Affective Reactivity Index: Validity and Reliability of a Clinician-Rated Assessment of Irritability

•The CL-ARI is a clinician-rated instrument that dimensionally assesses pediatric irritability.•The instrument can be used to assess transdiagnostic irritability.•The CL-ARI consists of a temper outburst, mood, and impairment subscale.•Psychometric properties of the CL-ARI are examined.•The CL-ARI shows good criterion validity and reliability.