From the Executive Summary: "The comparability debate is a distraction from the more important issue of how Title I can best close gaps. As we wrote previously in this series, Title I spends most of its resources on programs and services that don’t do much to help students. A more fruitful discussion would focus on how states and districts can spend their money effectively, by using evidence to identify programs that work on which Title I funds should be spent..."
See also Why Federal Spending on Disadvantaged Students (Title I) Doesn't Work