Effective Practice: School Designs

Brighter Choice Charter Schools
Edison Schools
k12
KIPP Schools 
National Heritage Academies
New York Charter Schools Association
New York Charter School Resource Center
New York State Loving Education At Home

Effective Practice: Curricular Resources

Center for Civic Education
Gilder Lehrman Institute of American History
Great Books Foundation
National Council for History Education
National Paideia Center
National Right to Read Foundation
Success for All

Single-Sex Education

Brighter Choice Charter Schools
International Boys Schools Coalition
National Association for Single-Sex Public Education
National Coalition of Girls Schools

Research Groups and Associations

Center for Civic Innovation at the Manhattan Institute
Center for School Change, a program of the Humphrey Institute of Public Affairs at the University of Minnesota
Education Commission of the States
Education Leaders Council
The Education Trust
Heritage Foundation
National Council on Teacher Quality
No Excuses
Teach for America
The Textbook League
Thomas B. Fordham Foundation