The Classroom Assessment Scoring System™ (CLASS™) is an observational instrument developed to assess instructional quality in PK-12 classrooms. It is a tool for analyzing the quality of teacher-student interactions in the classroom by capturing multiple dimensions of teaching that are linked to student achievement and development. It produces qualitative ratings of teacher performance on a scale from 1-7 across three broad domains: emotional support, classroom organization, and instructional support.
Yes, training is required for administration.
Access and Use
Allen, J. P., Pianta, R. C., Gregory, A., Mikami, A. Y., & Lun, J. (2011). An interaction-based approach to enhancing secondary school instruction and student achievement. Science, 333(6045), 1034-1037. https://www.doi.org/10.1126/science.1207998
Gregory, A., Allen, J. P., Mikami, A. Y., Hafen, C. A., & Pianta, R. C. (2014). Effects of a professional development program on behavioral engagement of students in middle and high school. Psychology in the Schools, 51(2), 143-163. https://doi.org/10.1002/pits.21741
Pianta, R. C., Belsky, J., Vandergrift, N., Houts, R., & Morrison, F. J. (2008). Classroom effects on children’s achievement trajectories in elementary school. American Educational Research Journal, 45(2), 365-397. https://doi.org/10.3102/0002831207308230
Allen, J., Gregory, A., Mikami, A., Lun, J., Hamre, B., & Pianta, R. (2013). Observations of effective teacher–student interactions in secondary school classrooms: Predicting student achievement with the classroom assessment scoring system—secondary. School Psychology Review, 42(1), 76-98. https://doi.org/10.1080/02796015.2013.12087492
La Paro, K. M., Pianta, R. C., & Stuhlman, M. (2004). The classroom assessment scoring system: Findings from the prekindergarten year. The Elementary School Journal, 104(5), 409-426. https://eric.ed.gov/?id=EJ696268