I'm sure most qualified teachers will tell you they are in desperate need of quality classroom materials. What this article doesn't address (and a quick search

I'm sure most qualified teachers will tell you they are in desperate need of quality classroom materials. What this article doesn't address (and a quick search reveals no answers) is that these materials _need_ to fit into a research-based curriculum. It's one thing to make engaging lessons, it's another to conclusively prove they teach the material.