Sources: American Federation of teachers; interviews with elementary and middle school teachers in California, Connecticut, Georgia, Iowa, Minnesota, New York, and Texas.

资料来源：美国教师联合会，采访了来自加利福尼亚、康乃狄格、乔治亚、衣阿华、明尼苏达、纽约和德克萨斯州的中小学教师。

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Randi Weingarten of the American Federation of Teachers said the plan appears to place all the responsibility on teachers, but gives them "zero percent authority."

VOA: special.2010.03.18

The recommendations were criticised by the American Federation of Teachers, which represents 1.5 million teachers.

BBC: NRA calls for armed guards in US schools

The American Federation of Teachers, the more reform-minded of America's two main teachers' unions, has lambasted the proposal.

ECONOMIST: Barack Obama��s plan to overhaul No Child Left Behind

The dead one is Al Shanker, the president of the American Federation of Teachers from 1974 to 1997.

ECONOMIST: Schumpeter