Concerned about the effect on diversity, many colleges have stopped requiring standardized tests. New research suggests that might be a mistake.David Leonhardt, a senior writer for The Times, discusses the future of SATs and why colleges remain reluctant to bring them back.Guest: David Leonhardt, a senior writer for The New York Times.Background reading: 

• The misguided war on the SAT
• From Opinion: Can the meritocracy survive without the SAT?

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