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The gathering of all inputs we have let into our lives for later processing.
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.
Any collection bucket for stuff.
Any input that has arrived in your world for which you have not defined the meaning.
This is where we decide exactly what each new input means to us.
Something you create (and trust) to alert you when you are required to do (or remember) something.