"Well-supported" is not a claim. What are your outcome measures, and why do they represent a good target?
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I would love for there to be a diverse, methodologically-sound body of literature on education, but that's not what I've found. The outcome measures are a big problem, for many of the reasons Harvard Education prof Daniel Koretz highlights in his book: https://www.amazon.com/Measuring-Up-Educational-Testing-Really/dp/0674035216/ …
In general, I'd like to see more studies: — examine more ambitious interventions — assess retention/skills over periods longer than a few hours, days, or weeks — assess adult outcomes — not resort to the obvious methodological/statistical "cheats" to get something usable