Sampling errors limit the accuracy with which forms can be linked. Limitations on accuracy are especially important in testing programs in which a very large number of forms are employed. Standard inequalities in mathematical statistics may be used to establish lower bounds on the achievable inking accuracy. To illustrate results, a variety of…

Preschool education is increasingly being recognized as an integral part of efforts to ensure that all children enter school ready to learn and as a way to help close the achievement gaps that exist at the time children enter kindergarten. Such efforts are growing across the country. According to the most recent data, 54 different preschool…

The concept is simple and attractive: Evaluate teachers on the basis of how much academic growth their students experience over the course of the school year. Often referred to as "value-added," this concept and the statistical methods for implementing it have been a topic of debate in state legislatures and at state and national…