After more than 20 years of research, class size continues to be at the forefront of the educational and political agenda for schools, school districts, and school boards. Here is what research tells us about class size and student achievement.

Key lessons from research. Key findings from research on class size, at a glance.

Lecciones Claves: Tamaño de la Clase y alcance del estudiante

Research review. A synthesis of research on class size.

Directory of resources. Organizations with information on class size.