that students understood and retained information more readily when subjected to frequent tests and quizzes while studying than students who simply read material over and over again.
So for those who whine that "testing isn't learning", maybe they're wrong after all.
My counselor when I was in high school was a former math teacher. After I became a math teacher he and my old principal, also a former math teacher, took me to breakfast. They asked how often I gave quizzes and didn't like my answer. Gotta quiz every week, they said, if not more than that. Since that day I've assessed student learning with either a quiz or a test each week. Now it seems there's some scientific validity to what those two men learned through experience--and passed on to me.
Maybe NCLB should mandate more tests per year! (said merely to tweak my anti-NCLB readers!)