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This is where the rubber meets the road and we get things done.
For knowledge workers, there is a lot of work to do defining our work before we can start actually doing our work. The 5 phases of workflow is the GTD model for capturing, defining and doing our work.
The next defined physical, visible action you will take to advance some purpose.
Examples include:
This is where we make sure our trusted system is current and complete.
Any set of similar items. Examples include:
This is where we put things into our trusted system where they need to go based on their meaning to us.
Any input that has arrived in your world for which you have not defined the meaning.
A mechanism to remind yourself of something at a given time in the future. When the time arrives, the contents of the tickler file are moved into an inbox for processing with all other stuff.
The practice of setting aside dedicated time (typically a couple of hours) to make sure your system is clean, current and complete. David Allen regularly cites this as the critical success factor for GTD.