Dr Hollier uses Turnitin (www.turnitin.com) for assignments and course gradable material. Turnitin is a plagiarism detection site, and is used to detect cheating/plagiarism by students from (but not limited to): websites, textbooks, publications, journals, and between students. Student work is checked between current students in my classes/other instructor classes, and previous students of mine/other instructors (see course syllabus for more detailed information).