The “Getting Things Done” method tells us to write all our tasks down – so you can use your mental space to take action on the tasks rather than try to remember them.
Source: Getting Things Done @ Wikipedia
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Excerpt: GTD puts heavy emphasis on documenting your work. Regardless of the tool you use to stay organized, whether it’s a complex project management suite or a notebook and a pen, get the things you have to do down in some format where you can be reminded of them.