This research study investigates the influence of independent variables on students' critical reflection scores in a library instruction program. A student sample (n=321), enrolled in English Composition II courses, participated in a four-session library instruction curriculum. Brookfield's Critical Incident Questionnaire was used as the main instrument to collect critical reflection data, and the Sparks-Langer et al. Framework for Reflective Thinking was used as a scoring instrument. Multiple regression analysis was conducted on 4 major theoretical constructs (academic achievement, semester, gender, age) and 6 theoretical assumptions (year in school, previous library instruction, transfer student, librarian, day of week, and time of day). Significance was found for academic achievement (p less than 0.01), gender (p less than 0.001), semester (p less than 0.001), and year in school (p less than 0.05) as predictors of critical reflection. (Contains 10 figures and 4 tables.)