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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 system of classifying into files (usually arranged alphabetically)
This is where we put things into our trusted system where they need to go based on their meaning to us.
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.