Developer branches

[Steve Ebersole]

We are using CVS to store Java source code.  Currently, all developers in
the project are directly commiting against HEAD.  We would like (as much as
possible) to keep HEAD in a stable state and so would like to start using
branches to create a dev environment.

Is this better approached by creating a single DEV branch or creating
seperate dev branches for each individual developer?  What are people's
experiences with either approach?

Thanks for responses.