An Outliner tool is a key digital list making aid (even if they all have their limitations). A good Outliner allows you to put making lists ‘on rails’ as Dave Winer put it. Moving an item up or down, to the top or the bottom. Nesting a thing under another, or deeper still. Moving a nested item up a level of hierarchy. Hide the subitems under a thing, or revealing them. Make a connection with an element elsewhere in an outline or with/in a different outline. Turn lines into bullets into numberings and back. Switch between different types of visualisation, one of which is the outline. All made seamless... jeroensangers.com