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As on-line interactive systems increase in popularity, several problem areas become more and more apparent. One of these is the management of the on-line accessible data base. It has been the experience of installations throughout the country that such a data base tends, if ungoverned, to increase in size as the system continues in operation, bounded only by the size of the storage available to contain it. It is, therefore, essential for the continuance of a viable system that this data base be examined and methods devised to control its growth.
Considine et al. (Wed,) studied this question.