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The perspective that encompasses your 5 year vision.
Your life as you'd like it to be 5 years from now.
The perspective that encompasses your 1 to 2 year goals.
The perspective that encompasses your whole life and why you're on the planet.
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 focuses on your current commitments (projects).
An outcome you desire that is achievable in less than 2 years.