Abstract: Video clips are depicted both in an overall layer and in a set of individual tracks, or rows. The user can cause the display to be expanded or collapsed, as desired, so as to reveal or hide the individual tracks. Video clips are fully editable in either the expanded or collapsed viewing modes. When the collapsed mode is in effect, bars representing individual video clips are still visible, and can be individually selected and manipulated. When the expanded mode is in effect, separate tracks are shown for each individual clip, but the overall layer remains visible, and the individual video clips also remain visible, selectable, and manipulable within the overall layer.