Class size as a distinct intervention mechanism in special education, distinguished from student–teacher ratio and caseload¶

Theory · All theories
Evidence · 2 claims (2 for) · 1 study (1 review), q1 · 0 of 1 report an effect size · 2 claims rest on one study

Description¶

The review organises its inquiry around class size as a distinct construct: "Class size refers to the number of students present in a classroom at a given point in time", distinguished from student–teacher ratio and caseload (students with IEPs per case-managing teacher). Its proposed mechanism is that "with smaller groups, teachers are better able to develop an in‐depth understanding of student needs through more focused interactions, better assessment, and fewer disciplinary problems". The framework also posits benefits for students sensitive to noise and social-cue demands, balanced against possible friendship and peer-effect losses in very small groups.

Design Implications¶

Context¶

Requirements¶

• Studies must measure class size at the individual or class level, not aggregated student–teacher ratios at school or higher levels

Constraints¶

• The review includes only segregated special education settings attended exclusively by students with special educational needs

Target Learners¶

• K-12 students with special educational needs in segregated special education settings

Target Learning Objectives¶

• academic achievement
• socioemotional development
• well-being

Claims¶

• A 1997 New York City report found that increasing resource room instructional group sizes from 5 to at most 8 students per teacher led to decreases in reading achievement [+W]
• Included qualitative studies find smaller special education class sizes are the preferred option because they allow more individualised instruction time and increased teacher attention [+W]

Related Theories¶

Examples¶

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Key Sources¶

• Bondebjerg, A., Dalgaard, N. T., Filges, T., & Viinholt, B. C. A. (2023). The effects of small class sizes on students' academic achievement, socioemotional development and well‐being in special education: A systematic review. Campbell Systematic Reviews, 19, e1345. https://doi.org/10.1002/cl2.1345