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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.
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.
A mechanism to remind yourself of something at a given time in the future. When the time arrives, the contents of the tickler file are moved into an inbox for processing with all other stuff.
Everything that enables you to empty your head and keep things off your mind.