Half a Worm: Why Education Policy Needs High Evidence Standards
Robert E. Slavin
There is a very old joke that goes like this:
What's the second-worst thing to find in your apple? A worm.
What's the worst? Half a worm.
The ESSA evidence standards provide clearer definitions of "strong," "moderate," and "promising" levels of evidence than have ever existed in law or regulation. Yet they still leave room for interpretation. The problem is that if you define evidence-based too narrowly, too few programs will qualify. But if you define evidence-based too broadly, it loses its meaning.
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