Notes
1. Think tanks or advocacy organizations that have blamed teacher shortages on at least one of these problems include The Education Trust, The New Teacher Project, the Center for American Progress, the Brookings Institution, the Hoover Institution, the Fordham Foundation, The Center for Restructuring Public Education, the Progressive Policy Institute, the National Council on Teacher Quality, The American Enterprise Institute, The Urban Institute and The Commission on No Child Left Behind (Aspen Institute).