Bugzilla - workflow customization

Question

I want to change the Bugzilla workflow so that a user won't be able to close a bug unless the bug has gone through some phases (e.g. ASSIGNED, IN_PROGRESS, etc).

How do I change Bugzilla in order to create my own work flow?

Answer 1

Have you tried changing the workflow from within bugzilla itself?

(Edit: updated URL for 5.0)

Answer 2

If your primary concern is permissions, you'll want to check out check_can_change_field in Bugzilla/Bug.pm.