How to set a filing system in our new office,naming & numbering files in order?

There are files belonging to legal side,administration,rent,electricity,pho鈥?to arrange systematically?How to set a filing system in our new office,naming %26amp; numbering files in order?
Check out the filing system by David Allen in his book Getting Things Done. Or for a more novel approach try out the Noguchi Filing System.How to set a filing system in our new office,naming %26amp; numbering files in order?
Scan the files and make them search enabled.
I would arrange all files based on category, then alphabetized, and then chronological (yearly).

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