For me a WIP is something that I am currenty working on, whatever the stage. A UFO is something that has sat, unworked on for more than a month or two. I intend to finish most of my projects, someday. Some just get set aside to work on a more impending project, or two, or three. Some of my UFO's are in rubbermaid tubs. Others are on my extra fancy quilt hanger (the treadmill in the family room) or on the back of the couch in my family room, which also happens to be my sewing room and computer room.