They are also doing a national study to determine the effectiveness of Open Court and Everyday Math.
Oh no, Mister Bill! Everyday Math!
Your reply gave me the vocabulary I needed to find information. Thanks.
This site notes that Open Court isn't very effective, but there aren't any citations.
This seems to be the paper you found. It has a lot of citations and presents details that don't support the advertised effectiveness of Open Court.
...they concluded that the “[r]esults show advantages for reading instructional programs that emphasize explicit instruction in the alphabetic principle for at-risk children”
There are many problems with the research. For one, the study received financial and personnel support from Open Court’s publisher at the time.... Another problem is that the version presented to the California State Assembly Education Committee May 8, 1996, a few months after Open Court was purchased by McGraw-Hill, and the version published after peer review in the Journal of Education Psychology in 1998 used considerably different data.
[more details about sample bias follow]
On all measures in both the prepublication and the published versions, the children in the classrooms with Open Court instruction had higher average pre-test scores than the children in the other classrooms.
