I use these "Incomplete Work Alerts" in conjunction with my students' "Ketchup" folders. Anything that comes to me that is unfinished gets one of these handy tags. It goes back into their incomplete work folder to be finished. I have my students leave the tag on their work so when it goes home their parents can see that work is being turned in without being finished.
**TIP! I copy these onto colored paper to give them an extra pop of color. It serves as a great eye-catching reminder of what students have to finish.