We use "Turnitin" at my institution. I instruct my students to always insert original thougths and ideas into their assignments. Frequently, however, my students have elevated similarity scores. These students email me to assure me that they have not "copied" or "plagiarized." I have to inform my students that an elevated score can occur even if all work has been properly cited and sorted. I let them know that the "Turnitin" score is a ratio of original thoughts and ideas as compared to those properly gleaned from outside sources. I encourage them to "re-think" and "re-word" in order to improve their submissions. I find it a bit more difficult to motivate students to think outside of the "box" in the online environment, but I find that increased interaction with the students, coupled with encouragement, leads to improved outcomes.