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Any collection bucket for stuff.
The gathering of all inputs we have let into our lives for later processing.
One of the modern worker's most commonly used and commonly misused media. GTD recommends:
Any input that has arrived in your world for which you have not defined the meaning.
A directory or folder on your computer that you use to collect electronic stuff for later processing. Recommended but not commonly implemented by computer users.
The practice of regularly and completely emptying all of your inboxes so that your trusted system is updated with the outcome of processing all of the new stuff. The opposite is trying to use, for example, your email inbox as a management system in itself.
A collection bucket for anything you write down or receive in paper form.
This is where we decide exactly what each new input means to us.
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.
Mechanism for receiving verbal messages from others. Treat it just like any other inbox.
Many mobile phones and dedicated dictation machines allow you to capture thoughts as you have them in the form of voice notes. A great collection tool to have with you at all times so you never have to remember anything again (as long as you remember to process the notes just like any other inbox).