A feature is not "done" until all of the following can be said about it:

1. All unit tests are green.
2. The code is as simple as it can be.
3. It communicates clearly.
4. It compiles in the automated build from a clean checkout.
5. It has passed unit, functional, integration, stress, longevity, load, and resilience testing.
6. The customer has accepted the feature.
   
7. It is included in a release that has been branched in version control.
8. The feature's impact on capacity is well-understood.
   
9. Deployment instructions for the release are defined and do not include a "point of no return".
10. Rollback instructions for the release are defined and tested.
11. It has been deployed and verified.
12. It is generating revenue.