Nobody likes clutter, but it can be hard to let go of items you've had around for a long time. Speaking with The Wall Street Journal, author Jennifer Baumgartner suggests you apply the 80/20 rule to your stuff to help you get rid of it.
Using the example of clothing, Baumgartner breaks it down like so:
Remember the 80/20 rule: Most people wear only 20% of their clothing 80% of time. Much of the rest reflects past sizes, past self-images or past life roles. Recognise them for what they are. "If you want to move forward, release the past, starting with your closet," writes Jennifer Baumgartner in her book "You Are What You Wear."
Essentially, get rid of what you don't wear, what you'll never wear again, and anything you might have purchased and never used. Baumgartner's suggesting this for clothing, but it's useful for everything in your house — books, movies, computer parts, music, games or whatever — if you're not using it 80 per cent of the time, ditch it.
The Psychology of Clutter [The Wall Street Journal]