This study examined the effects of the use of two memory aids, note taking and mental rehearsal, on memory. Thirty-four undergraduate college students were assigned to either take notes on or think about words and ideas that would help them to remember a list of words that they were later asked to recall. Participants who used mental rehearsal recalled significantly more words than participants who used note taking. The results suggest that in certain conditions, mental rehearsal is a more effective memory aid than note taking. Mental rehearsal requires constant thinking, which may allow information to be processed more effectively.