It used to be that all we had was the final version of a student’s work. We couldn’t see revisions, trial and error, and collaborate work with others.
However, with Google Apps that is not the case. Google provides you with your own personal time machine in a tool called Revision History, which lets you see every change ever made to a document, when the change was made, and who made the change. This powerful tool is available in Google Documents, Slides, Sheets, and Drawings.