The differences between open-book, cheat sheet, and closed-book exams were examined in two different types of psychology courses. A total of 297 students enrolled in eight sections of Introductory Psychology and 99 students enrolled in four sections of Statistics participated in this study. Exam types were counterbalanced across sections of the same course. Students were given either open-book, cheat sheet, or closed-book exams, took a surprise quiz two weeks after the exams to measure retention of course material, completed a preference questionnaire, and took a pre-test measure of test anxiety on open-book and cheat sheet tests. While students did slightly better on open-book exam than on closed-book exams, they also much preferred open-book and cheat sheet exams over closed-book exams, and had lower levels of anxiety when taking open-book exams compared to cheat sheet exams. Based on these results, open-book exams may be a superior style of examination for a variety of psychology courses. (Contains 2 tables and 2 figures.) [This research was supported in part by an Academic Excellence Grant from Dominican University of California.]