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Examining Rater Effects on the Classroom Assessment Scoring System.

Kara M Styck1, Christopher J Anthony2, Lia E Sandilos3

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Area of Science:

  • Educational Psychology
  • Classroom Assessment
  • Child Development

Background:

  • The Classroom Assessment Scoring System (CLASS) is widely used to evaluate teacher-child interactions.
  • Existing research shows limited correlations between CLASS scores and child outcomes.
  • Observer severity differences may contribute to score variability.

Purpose of the Study:

  • To investigate the extent and influence of rater effects on CLASS scores.
  • To determine if accounting for rater variability enhances the predictive validity of CLASS scores for child outcomes.

Main Methods:

  • Utilized data from 77 teachers rated by 13 independent observers.
  • Employed statistical methods to identify and adjust for rater effects across CLASS domains.
  • Examined the relationship between adjusted CLASS scores and child outcomes.

Main Results:

  • Significant rater effects were detected across all three CLASS domains.
  • Adjusting CLASS scores for observer severity did not strengthen the association with child outcomes.
  • The study found no improvement in predictive validity after accounting for rater effects.

Conclusions:

  • Rater effects are present in CLASS assessments but do not fully explain the weak link to child outcomes.
  • Further research is needed to understand the limited relationship between CLASS scores and child development.
  • Implications for the interpretation and application of CLASS and similar observational tools are discussed.