Proposal for using Pivotal Tracker:
* The REQUESTER of a story is responsible for evaluating the completion of a story. For code implementation stories, this includes provision of a test.
* The OWNER of a story implements/completes a story. Owners aren't assigned until the requester can evaluate delivery of a story.
* A story can be in the ICEBOX without delivery criteria, but it must have an requester.
* A story can be in the BACKLOG without an owner, but it must have delivery criteria.
* A story cannot be in a SPRINT without a requester, delivery criteria, and an owner.
