Getting Things Done is a time-management method, described in a book of the same title by productivity consultant David Allen. It is often referred to as GTD.
The GTD method rests on the idea of moving planned tasks and projects out of the mind by recording them externally and then breaking them into actionable work items. This allows one to focus attention on taking action on tasks, instead of on recalling them.
The GTD workflow consists of five stages: capture, clarify, organize, reflect, and engage. (The first edition used the names collect, process, organize, plan, and do; the description of the stages are the similar in both editions). Once all the material ("stuff") is captured (or collected) in the inbox each item is clarified and organized by asking and answering questions about each item in turn as shown in the black boxes in the logic tree diagram. As a result, items end up in one of the eight oval end points in the diagram