The Tickler Filing System

Basicly a file for each day. And a folder for each month etc...

The advantage of using file folders (instead of the old sales tickler system of index cards or even your calendar) is the ability to store the whole document or piece directly into the file (the actual form that needs to be filled out, the memo that needs reviewing then, the telephone note that needs action on a specific date, etc.)

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They even give examples David Allen is well massive.