The effect of an advance organizer on post test performance was studied in a 2 X 2 X 2 factorial design with the effects of the organizer, pretest and mathematics learning passage controlled. An advance organizer of approximately 500 words and a learning passage of approximately 1,000 words were developed. A 41-item multiple choice test based on the three levels of Bloom's taxonomy was also developed. Two hundred college students were randomly assigned to treatments wherein the interaction of pretest, advance organizer, and learning passage were systematically varied. When the learning passage and an advance organizer were presented together, no significant differences in post test scores were found. On the other hand, in the absence of a learning passage, the presence of an advance organizer did result in significantly higher post test scores as opposed to the absence of an advance organizer. The results also indicated that the interaction of pretest and advance organizer yielded significant improvement in post test scores. Thus, there is reason to believe that the combined effect of a pretest and an advance organizer is important in improving post test scores. The findings are discussed as they relate to previous studies identifying interaction effects. (Author/MV)