The Workshop module is a self- and peer-assessment activity in Moodle that has a multistep process for users as they submit, review drafts (their own and others work) and then by the teacher. Moodle manages the workflow automatically once the workshop is setup. Frederic Nevers of iTeachwithMoodle has created about an 18 minute presentation that covers the ins and outs of setting up a Workshop module and each of the 5 stages of using the activity.
Note that some usability and workflow has been simplified since 2.3 to give teachers more recognizable progress of what stage the Workshop is in.
Check out iTeachwithMoodle at: http://www.iteachwithmoodle.com/
Video link: https://www.youtube.com/watch?v=0Fx9feByAvs