California has one of the latest kindergarten entry cutoff dates in the nation, December 2, which effectively allows children as young as four years, nine months to enter kindergarten. Proponents of moving the cutoff date to earlier in the year contend that children who enter kindergarten before age five are not developmentally mature enough yet…

Children's number sense in kindergarten was used to predict their calculation fluency in second grade (N = 198). Using block entry regression, usual predictors of age, reading, memory, and verbal and spatial cognition were entered in the first block and number sense measures were added in the second block. Number sense measures contributed a…

The purpose of this study was to examine factors influencing easier transitions and placements of young children with disabilities into Part B preschool special education programs. The authors examined associations between children's referral age and the following factors: (a) level of functioning of the child, (b) educational level of the mother,…

In this appendix to our Occasional Paper, we review 14 recent rigorous studies on how entrance age affects student outcomes in the short and long term, paying particular attention to aspects that are most relevant to state-level policy decisions. We summarize findings related to elementary and secondary academic achievement, grade retention,…