Paired-comparison measures by students, after being normalized, did not agree very well with Flesch reading ease scores.Many attempts have been made to evaluate the readability of textbooks by using formulas. The bases for most of these formulas are syntactic complexity and word characteristics such as familiarity. In most readability formulas the approach is to count features such as number of syllables per 100 words or number of words per sentence in a given passage of the text. The Flesch readability formula uses this type of statistical analysis to determine the reading ease of a book.Such structural analyses have been criticized for not taking into account such things as semantic interactions and connotations. Huggins and Adams (1980, p. 91) claim that the "main weakness is that the difficulty of a passage involves its comprehension, and surface structure descriptions capture only some of the syntactic variables necessary to comprehension."Quereshi and Buchkoski (1979) had students rate reading ease based on two randomly selected paragraphs from each of 61 introductory psychology textbooks. They reported significant, but lower-than-expected correspondence between these subjective ratings and Flesch scores.The purpose of the present study was to determine if subjective and Flesch-score readability would correspond, using a variety of paragraphs on matched topic areas from different introductory psychology texts.Methods. The participants were 184 two-year college students enrolled in a three-credlt-hour undergraduate course entitled "Principles of Psychology It." The students varied w~th respect to college major. All were volunteers and were taught by the coauthors. The study was conducted on the last day of winter quarter's classes.During the winter quarter of classes, we asked for volunteers from eight sections of "Principles of Psychology 11," the final course in introductory psychology, to participate in a study on textbook readability. It was thought that these students would be familiar enough with psycholog~cal terms to understand the selections outslde the context of a whole chapter. Further, it seemed that after two quarters of introductory psychology the studepts would be more alike in their psychology background than would entering freshmen, who could range from zero to one year of study in the discipline, depending on their secondary school course selection.We selected four topics that were common to most lntroductory psychology textbooks.