"Everyday Mathematics is the most researched and trusted elementary math curriculum in the United States. It is the program of choice for nearly four million students nationwide."
"The highly efficient paper-and-pencil algorithms that have been traditional in the U.S. may no longer be the best algorithms for children in today’s technologically demanding world. Today’s elementary school children will be in the workforce well into the second half of the 21st century and the school mathematics curriculum should reflect the technological age in which they will live, work, and compete."
"Research shows that students learn best when new topics are presented at a brisk pace, with multiple exposures over time, and with frequent opportunities for review and practice. The sequence of instruction in the Everyday Mathematics curriculum has been carefully mapped out to optimize these conditions for learning and retaining knowledge. Test results show that this approach works."
I'm particularly keen on the 21st century argument. Apparently, in the 21st century people are going to do things a lot slower.