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The collection bucket for everything you have committed to read or review.
Any set of similar items. Examples include:
Something you have made a commitment to read or review that will take more than 2 minutes. Examples include magazines, proposals, brochures, etc.
The set of things you need to discuss or progress with a given stakeholder.
Anything that has a day or time context to it should be placed on your calendar.
A mechanism to store and retrieve electronic reference material on your computer.
A system of classifying into files (usually arranged alphabetically)
The complete inventory of the next physical, visible action you will take to fulfil some purpose.
Any input that has arrived in your world for which you have not defined the meaning.