Argues that the original Degrees of Reading Power (DRP) test scores indicated large mismatches between the average difficulty of the textbooks used in each grade and the average ability of students in that grade. Presents a rescaling procedure to provide new, valid DRP test scores and grade equivalent scores for selecting instructional materials.…

Outlines three constructs of text difficulty: text-based (objective), performance-based (behavioral), and a combination of the two (subjective). (HOD)

Methodological problems have plagued evaluation researchers in their attempt to provide data for making decisions about selection of curricula and instructional materials. This report describes how two methodological problems were handled to assist a city school district derive meaningful data and apply findings to the selection of a basal reading…