If students are working on a quiz over a period of more than one sitting, and they want to save their work, at present they must refrain from using the "Submit" button and simply stop using the quiz. Thereafter, they may resume the quiz at another time by hitting the "Resume Quiz" button--but only if they have NOT hit "Submit." It would be much less confusing if there were simply another button at the bottom of the quiz that says: "Save and submit later." In the settings of the quiz, the teacher should have the option to choose to make this "Save and submit later" button operable.