The Behavior Intervention Rating Scale (BIRS; Elliott & Treuting, 1991) was developed to measure teachers’ perceptions of the treatment acceptability and perceived effectiveness of classroom interventions. The 24-item BIRS consisted of a revision and extension of the Intervention Rating Profile (IRP-15; Martens et al., 1985) and comprised two subscales: the Intervention Rating Profile (IRP) and the Effectiveness Rating Profile (ERP). Each item was rated using a 6-point Likert format by a sample of 216 teachers attending graduate courses. An oblique factor analysis was utilized, and three factors, Acceptability, Effectiveness, and Time of Effect, were determined. The total BIRS yielded an alpha of .97. There was a high correlation between Acceptability and the Evaluation factor of the Semantic Differential (SD; Osgood, Suci, & Tannenbaum, 1957), and a high correlation with Effectiveness factor, and a moderate correlation with Time. (APA PsycTests Database Record (c) 2019 APA, all rights reserved)