The results of which were - effectively - buried.
It’s a story of intrigue, ideology and education failure.
A thread
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Short summary: nifdi.org/what-is-di/pro…
Medium summary: darkwing.uoregon.edu/~adiep/ft/gros…
Long summary: zigsite.com/for_readers_no…
Uber-long research project: behavior.org/resources/901.…
And introduction: shallteach.wordpress.com/2020/05/18/di-…
Why isn’t it more popular? shallteach.wordpress.com/2020/05/06/why…
How and why it’s different shallteach.wordpress.com/2018/12/03/di-≠-di-and-why-that-matters/
Spoiler alert, modern studies still find it to be super effective.
arthurreadingworkshop.com/wp-content/upl…