This study sought to determine a useful frequency for refreshing students' memories of complex procedures that involved a formal computer language. Students were required to execute the Microsoft Disc Operating System (MS-DOS) commands for "copy,""backup," and "restore." A total of 126 college students enrolled in six sections of a computer literacy course were randomly assigned to one of three groups: biweekly reviews, monthly reviews, and no reviews of these commands. A comparison of pretest and posttest scores indicated that the control group (no reviews) retained little of what they had learned, while the biweekly and monthly groups retained much of what they had learned. The monthly groups retained as much as the biweekly group, suggesting that monthly reviews are sufficient to significantly improve the long-term retention of complex procedures. An appendix provides instructions given to students participating in the study. (Contains 27 references.) (MDM)