Interested in using the CLASS assessment for your Birth to Grade 3 Classroom? ECA is certified as a licensed observer of the Classroom Assessment Scoring System at the infant, toddler, pre-k and K-3 levels.  CLASS, a tool that has been validated in thousands of classrooms across the nation, provides a common lens for defining, assessing and measuring classroom interactions. CLASS focuses on the quality of the classroom interactional processes that facilitate learning, concept development and language.