When the Educational Testing Service became the administrator of the National Assessment of Educational Progress (NAEP) in 1983, it introduced scales based on item response theory (IRT) as a way of presenting results of the assessment to the general public. Some properties of the scales and their uses are discussed. Initial attempts at presenting…

A new approach to the quantification and interpretation of change when only repeated cross-sectional data are available--the Trajectory Analysis of Matched Percentiles--is presented. A recent attempt to interpret the findings on reading achievement of the National Assessment of Educational Progress is critically analyzed. (SLD)

In 1982, the Educational Testing Service (ETS) proposed to implement a new, complex design for the National Assessment of Educational Progress (NAEP). The major features of this design are described in "A New Design for a New Era" (Messick, Beaton, and Lord, 1983). The purpose of this document is to describe the actual implementation of…