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The perspective that encompasses your whole life and why you're on the planet.
The reason you're here. You'll have to figure that one out. Or not. Maybe just watch TV.
The perspective that encompasses your 5 year vision.
GTD is a "bottom up" approach that focuses on mastering the mundane. Once that is done, though, there are higher perspectives that can really make the system bring about great results.
The perspective that encompasses the areas of your life that you need to maintain.