„A new analysis from the National Assessment of Educational Progress, a Census-like agency for school statistics, shows that of the fourth-grade teachers surveyed, 71 percent said they had grouped students by reading ability in 2009, up from 28 percent in 1998. In math, 61 percent of fourth-grade teachers reported ability grouping in 2011, up from 40 percent in 1996.“
fairfieldmathadvocates.com am 9. Juni 2013