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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.
An action that needs to happen on a specific day, but not necessarily at a specific time. For exampe, "call Dad for his birthday".
The process of creating specific, physical, visible action steps to move towards some outcome.
Defines explicitly what we naturally do when planning anything. David Allen recommends we use it consciously to increase personal and team productivity. If more clarity is required on a project, move up the model. If more action is required, move down the model.
This is where we put things into our trusted system where they need to go based on their meaning to us.
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.