I posted something earlier about Prince William County, Virginia, refuting Pearson's "Evidence of Success" of Investigations. A person in PWC says it better than I did:
"We were told that MI was research proven. Well the research the school board was citing was a document called “Investigations in Number Data and Space: Evidence for Success”. A very diligent parent called every school district in that marketing brochure and most have dropped or are dropping MI. The rest are either heavily funded with large numbers of title 1 schools or very small school districts."
This document is an incredibly important indictment; not only against Investigations but against the marketers selling this snake oil.
A blogger named Black Velvet Bruce Li has been making YouTube videos serving as a documentary of the proceedings of the Prince William County School Board. His latest addresses the above mentioned document.