Abstract: A method for maintaining a record of set-creating data processing activities and associated data sets. The method includes the steps of creating and displaying a plurality of visual representations, one for each of the set-creating activities, and arranging the visual representations to indicate a hierarchical relationship within the set-creating activities. The visual representations may be used to select for viewing a particular one of either the set-creating activities or the associated data sets, and displaying them on the data processing system. The display may correspond to a duration of an operator input activity, or to a time interval defined by an initiating operator input at a terminating operator input. In its simplest form, the method requires the arrangement of the visual representations in a hierarchy which corresponds to set-creation chronology.