Classroom Assessment Scoring System (CLASS)

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.

Content

Domains
Subdomain
Topics
Classroom Instruction
Grades
PK-12
Languages
English
Respondent
Observer

Administration information

Length
Four cycles of 15 minute observations.
Price

Varies

Training
Yes, training is required for administration.
Administration
Individual,
Observation
National Sample
Yes

Access and Use

Instrument Use in Peer-Reviewed Studies

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.

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.

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.

Psychometrics

Scoring
Manual scoring
Referencing
Norm-referenced
Open Access
No
Resources on Psychometric Properties

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.

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.