1. A graphical user interface for viewing relationships among media objects in an editing system, wherein the media objects are defined using a plurality of classes, and wherein media objects in each class have a bidirectional relationship defined with media objects in other classes, and the graphical user interface comprising: a first pane; a second pane associated with the first pane; means for receiving an indication of a selection by the user of a selected use relationship comprising a relationship selected from the group consisting of a forward and a backward relationship; means for receiving an indication of a selection by the user of one or more media objects; means, operative in response to the user selected one or more media objects and the selected use relationship, for identifying media objects having the selected use relationship with the selected one or more media objects; and means for displaying the selected one or more media object in one of the first and the second panes and the identified media objects in the other one of the first and the second panes according to the use relationship between the media objects.