Finding Open-Loop Easy
The open-loop is “opened loop” as it means in my tagging method. This simplicity makes possible to find open-loop much easier, even in the chronological sequence.
If you find two-separated dots in the sequence, that is open-loop. After accomplishment of the GTD card, the open-loop is closed (filled) which looks like a bar.
Ref. : @blog, Finding Open-loop Easy