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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 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!
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.