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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.
This is where we make sure our trusted system is current and complete.
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!