> Overall, they're an excellent investment and the data shows that they work.

Searching, I'm finding mixed results. It seems like some studies show that they have worked in specific situations, whereas others show that they have not worked on other specific situations. I wasn't able to find a comprehensive survey that drew overall conclusions. Are you aware of one?

I'm also finding little research on the impact of a charter school on students of the public schools which they would otherwise have attended.

Are these topics that the book addresses?