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If you work as a team, a great way to collaborate over documents is to set up a Google Group, with the whole team as members (2 of you will need to be owners too), and share a single Drive folder with the group email address.
This means that any documents inside the folder will automatically be shared with the whole group.
If a new person arrives, or someone leaves, you simply add to/remove from the group and their access is immediately changed.
Groups are not automatically private, so make sure you check up, using the links below, what settings to change to make sure your group isn't public.
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Read this Google Document about Using Groups to Collaborate
Visit the Google Groups support pages
(4' 11") A clear demonstration showing how to share a Drive folder with a Google Group, and how the group members can find it after it has been shared. He's obviously talking about a 'school', but that doesn't get in the way of the explanation.