Using the Pizza Hut "Book It" Program which encouraged students to read a certain number of books per month, a study examined the effect of this program on standardized test scores. Subjects, 98 fifth grade students, were placed in high, middle, or low reading groups according to teacher assessment. Half of the students from each group participated in the reading program. Each student chosen had an I.Q. in the average range, and students with I.Q.'s above or below average were not selected. Improvement in reading ability for each student was measured by the difference between the composite reading scores on the Metropolitan Achievement Tests at the end of the fourth and fifth grades. Results indicated no statistical difference between the experimental and control groups in improvement of reading ability for the high and middle reading groups. In the low reading group, significant differences in reading ability between the control and experimental groups were found, indicating that students who participated in the recreational reading program had more improvement in reading ability than those who did not participate. (Three tables of data are included, and two pages of footnotes and 19 references are appended.) (MM)