Once upon a time, American students tested better than any other students in the world. Now, ranked against European schoolchildren, America does about as well as Lithuania, behind at least 10 other nations. (46)The relative decline of American edu- cation at the elementary- and high-school levels has long been a national embarrass- ment as well as a threat to the nation’s future.
For much of this time--roughly the last half century-professional educators believed that if they could only find the right method of instruction, all would be well. (47)However, nothing seemed to achieve significant or lasting improvements, yet in recent years researchers have discovered something that may seem obvious, but for many reasons was overlooked or denied. What really makes a difference, what matters more than the class size or the textbook, the teaching method or the technology, or even the curriculum, is the quality of the teacher. Much of the ability to teach is
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