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Little Sleepers: Long-Term Effects of Preschool

Robert Slavin

Huffington Post

Sep 29, 2017

"it is difficult to measure outcomes among four year-olds. They can be squirrely and inconsistent. If a pre-kindergarten program had a true and substantial impact on children’s literacy or language, measures at the end of preschool may not detect it as well as measures a year later, because kindergartners and kindergarten skills are easier to measure."