The Influence of Intrabook Readability Variation on Oral Reading Performance
John M. B. Bradley, Wilbur S. Ames · The Journal of Educational Research · 1976
The effect of intrabook readability variation on the oral reading performance of 51 intermediate grade students was studied. The results suggest that an instructional reading level obtained through the use of a typical informal reading inventory (IRf) predicts a student's level of functioning for only a portion of a basal reader. Since no systematic pattern of intrabook readability variation has been found with basal readers it is difficult, if not impossible, to determine which portion of a book relates to IRI results.