Status of Class Size Reduction Initiative What the Research Says Purpose of This Study Study Design   Effect on Special Populations Staff Development Classroom Practices Parent Involvement Implementation Challenges   Effect on Special Populations Staff Development Classroom Practices Parent Involvement Implementation Challenges   What Are the Trade-Offs Posed by CSR in Serving LEP Students? What Are the Trade-Offs Posed by CSR in Serving Students with Disabilities? To What Extent Are Teachers' Practices Different in Smaller Classes? What Changes in Parental Involvement Should Be Expected and Why?