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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.
The process of creating specific, physical, visible action steps to move towards some outcome.
The physical, emotional or intellectual horsepower you need to complete an action. It's good to always have some really easy things you can do when you're not feeling on top of your game!
This is where we put things into our trusted system where they need to go based on their meaning to us.
The process of defining the components of achieving a desired outcome.
For example, if the desired outcome is a dinner party, the components might be:
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.