Came accross this handy website, yes they do try to sell you things but the Clutter Control Rules are there and free:

www.thecleanteam.com/Rules-Clutter

Briefly they are:

Rule 1: When in doubt, throw it out.
Rule 2: Use it or lose it.
Rule 3: Efficiency counts, so store things accordingly.
Rule 4: Handle something once.
Rule 5: Recycle it.
Rule 6: Pick a number and stick with it.
Rule 7: Use a file cabinet.
Rule 8: Do Something.
Rule 9: A place for everything, and everything in its place.
Rule 10: Items displayed in the house have to pass a test.
Rule 11: Don't do things "later."
Rule 12: Label things.
Rule 13: Call in a professional.

Martind43