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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 for keeping paper reference material, usually organised alphabetically.