For parents who believe Investigations isn’t right for their children, this report will come as no surprise. For others, however, discovering that the “research” that underlies Investigations isn’t based on scientific protocols and that no independent studies have ever verified the publisher’s claims of success, might be a bit shocking.
From the “What Works ClearningHouse”, a Division of the US Department of Education Institute of Education Sciences…
“No studies of Investigations in Number, Data, and Space® that fall within the scope of the Elementary School Math review protocol meet What Works Clearinghouse (WWC) evidence standards. The lack of studies meeting WWC evidence standards means that, at this time, the WWC is unable to draw any conclusions based on research about the effectiveness or ineffectiveness of Investigations in Number, Data, and Space®. “
You can find the full report here.