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Any input that has arrived in your world for which you have not defined the meaning.
The gathering of all inputs we have let into our lives for later processing.
Any collection bucket for stuff.
This is where we decide exactly what each new input means to us.
Anything that has a day or time context to it should be placed on your calendar.
The next defined physical, visible action you will take to advance some purpose.
Anything you're committed to that will take more than one action step to complete.
Something you have made a commitment to read or review that will take more than 2 minutes. Examples include magazines, proposals, brochures, etc.
Anything you keep for future reference. It is very important not to blur the lines between things that require action and those that are purely reference material.
Something you create (and trust) to alert you when you are required to do (or remember) something.
Something you are not committed to following up on, but may wish to in the future.
Something you are expecting someone else to do and want to track.
This is where the rubber meets the road and we get things done.
One of the modern worker's most commonly used and commonly misused media. GTD recommends: