I was in the company of some 7,500 math educators last week, during the annual meeting of the National Council of Teachers of Mathematics in Denver. Along the way, I had the chance to hear from a lot of people about the Common Core State Standards: what they think of them, their early experience with the standards, and what about the common core perhaps keeps them up at night.

The big take-aways in this very unscientific sample—gleaned from conference presentations as well as hallway conversations I had with teachers at the Denver Convention Center—were mostly high regard for the standards, mixed with some nervousness about implementation, including the tests to come.

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