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.
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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.