
What 'evidence-based' actually means when an edtech vendor says it
Under federal law there are four tiers of evidence, and most sales decks are quoting tier IV — the tier that means 'a logic model.'
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Under federal law there are four tiers of evidence, and most sales decks are quoting tier IV — the tier that means 'a logic model.'

A 2007 federal practice guide gave testing-based study strategies its strongest evidence rating, but newer classroom studies show the real gains are smaller and more subject-dependent than professional-development slides suggest.

Federal law never says a classroom app can have student data by default. A narrow exception does the work, and a wave of new state laws is now building stricter rules on top of it.