This paper investigates how students' attitude and performance are affected by using an asynchronous learning network (ALN) to augment exams in a traditional lecture/lab course. Students used the ExamNet ALN to create, critique, and revise a database of questions that subsequently was drawn upon for course exams. Overall, students considered ExamNet to be useful and important in understanding course material, reviewing for exams, and succeeding in the course. Most found the process of developing exam questions to be intrinsically motivating and an interesting part of the course.