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While interesting, this is certainly not unexpected - a previous study by Cuevas, Lee, Hart, and Deaktor (2005) showed that inquiry instruction does indeed yield greater increases in achievement for low-achieving, low-SES at risk students.
Brock says that each of the schools using the program has documented significant increases in achievement, reduced referrals to special education programs and even reduced disciplinary problems.
Not every study of professional development approaches shows increases in achievement, and there are other factors that underlie more and less effective innovations.
Both groups of incentivised indicators showed overall increases in achievement significantly above the predicted rates (table 4).
There were significant increases in achievement rates for all four indicator groups between 2004-5 (the first intervention year) and 2006-7 (thirdhinterventiontion year).
Some studies have found significant increases in achievement between students who used groups and those who did not (Sokolove and Marbach-Ad, 1999; Burrowes, 2003; Maloof and White, 2005; Tessier, 2007).
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Overall, the correlation was small, meaning that you couldn't predict an increase in achievement in math and reading proficiency based on the increase in charter school enrollment.
We can't say definitively what triggered the increase in achievement scores, but we believe it was driven by the organizational, market, and economic forces that were in play.
And with the large increase in achievement data produced by the accountability era, we now have a better sense of where inequalities exist, not just nationally, but also within school districts and also within individual schools.
In the last column, where the language count coefficient is largest, an additional foreign language corresponds with an increase in achievement of 0.001 percent of standard deviation.
Holding all else constant, increasing the frequency of using this practice from say some lessons to about half the lessons was associated with a predicted increase in achievement of 0.33 standard deviations in the U.S. and 0.33 standard deviations in Singapore.
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CEO of Professional Science Editing for Scientists @ prosciediting.com