Teachers love how easy it is to collaborate with their students, not having to worry about losing the file and all the other bonuses that using Docs brings, but tracking down assignments can be a nightmare. I’ve covered this before from the teachers perspective and the students perspective here, but I’ll run through how I do it step by step.
http://thetechcurve.blogspot.ca/2012/04/managing-google-docs-in-classroom.html