We tested the effects of two embedded review question formats and the application of web design guidelines in a computer-assisted mastery learning course in developmental psychology. Students used either a branching review question format that redirected them to relevant portions of the study module after incorrect answers or a linear format that only provided the correct answer and then continued to the next review question. Students who used the branching format scored higher on their first attempt to pass the mastery quiz, and they required fewer tries to achieve the 90% mastery criterion. The effectiveness of web design guidelines was evaluated based on students' opinions. Students with positive opinions about the readability and navigational usability of the study module scored higher on their first quiz.