Vocabulary development is critical for children's ability to learn to read and their success at school. Vocabulary has also been identified as a key factor in the achievement gap, with children from low-income families knowing significantly fewer words when they enter school. Although book reading has long been celebrated as an effective way for…

Schools across the nation are responding to reading assessment mandates by turning to DIBELS (Dynamic Indicators of Basic Early Literacy Skills), a program endorsed by the Federal Reading First Grant Office, to assess fluency on a range of reading-related tasks. DIBELS makes strong claims regarding its usefulness in documenting reading progress…