[en] A multimedia training program in criticality safety has been developed for fissile-material handlers who work at the Hot Fuel Examination Facility (HFEF) complex at Argonne National Laboratory. The training program consists of a course in the basic theory of nuclear criticality to give employees an understanding of the reasons for the specific rules for handling fissile materials. Successful completion of written tests on the theory of criticality and the specific rules is a prerequisite to entering the on-the-job training phase. Continual training and recertification requirements help to keep personnel aware of the importance of safety. (U.K.)