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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 chart or series of pages showing the days, weeks, and months of a particular year, or giving particular seasonal information.
A system of classifying into files (usually arranged alphabetically)
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.