This investigation attempts to determine if the congruity in textbook-test content varies as a function of different styles of textbook use. Across all standardized tests, instructional validity of the five styles of textbook use was far lower for the management-by-objectives model than for any other styles. (Author/PN)

A taxonomy was developed for classifying instructional materials in fourth grade mathematics, as well as the content of actual classroom instruction and of achievement tests. The taxonomy is defined by the intersection of three factors and results in 468 cells: (1) mode of presentation (for example, use of graphs, tables, story problems)--3…