The major cause of UFO's for me is ADD. I will get a quilt almost finished and can't wait to start the next project. So I start that one with the intention of finishing the last one as I go along. Ha! Never happens. Then I will dig in my stash to find a back for a quilt that I actually finish and end up picking out and possible cutting fabric for another quilt or 2. I have been piecing my backs so I don't have to buy any more fabric. My stash is out of control!