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Abstract
Current external criticism of American schooling includes an assumption that content textbooks used in upper grades fail to challenge the abilities of pupils. To investigate this assumption, the multiformula readabilities of 111 content textbooks currently employed in grades six through nine in 30 middle or junior high schools were obtained. Five and six formula, same sample readability data were collected and analyzed by 37 teacher researchers. Two or more formulas placed 49% of these texts one or more grade levels above grade of use. The results also were analyzed in light of current concerns about the accuracy and use of readability formulas. Readability placements varied notably and significantly between‐texts and within‐texts for each content area and grade level of use. Significant mean differences occurred in grade placement by formulas differing in comprehension criteria and in word count procedures. Extending sample selection from three to six and nine within‐text samples did not change readability estimates notably or significantly. Teacher researcher procedural error occurred rarely. Teacher participants preferred the formulas combining realistic school estimates with efficiency in estimation.