EdReports, a research organization which began in 2014 to examine textbooks, grades how well they align with Common Core. Many text books claim to be compatible with Common Core but don’t understand what that compatibility consists of. Out of five textbooks recently evaluated, only one was properly aligned.

Several HS Math Textbooks Not Aligned With Common Core, Ratings Group Finds #dyscalculia
Many textbooks are not actually aligned with Common Core standards.
EdReports is funded by organizations like the Gates foundation. EdReports has complex criteria for examining and grading text books which results in a scoring which educators can use to select text books that fit into their class rooms and teaching styles. With research like this more textbooks will align to Common Core.
A number of high school math textbooks claiming to be aligned with the Common Core standards aren’t, according to an analysis by EdReports, a non-profit that bills itself as the “consumer reports” of instructional materials in schools.
"Key Takeaways:
EdReports provided research showing that many text books are not compatible with Common Core.
EdReports is funded by the Gate Foundation and other high profile groups.
EdReports has a system of evaluating textbook alignment with Common Core.

