The Research Origins of CLASS
Research leading to the current version of the CLASS tool began in 1991 as a part of the NICHD Study of Early Child Care and Youth Development, which examined the influence of early environments and classroom processes on the development of children from a variety of family backgrounds. Study findings clearly indicated that classroom processes impact student outcomes (NICHD EECRN, 2002; Pianta et al., 2005).
With this knowledge, the research team further refined the initial observational tool (the Classroom Observation System: COS) for use in the National Center for Early Development and Learning (NCEDL) study. This large-scale study examined the quality of publicly funded preschool programs to learn how variations in quality impacted children’s academic and social outcomes.Topics: Research Read More