Why done should be "in use".

Done. Funny word that. When is something done? Is it when it's checked into version control? When is passes all our autmated acceptance tests? When QA says so? Or is it when we got real users deriving value from it? I would say the later based upon this simple observation. As a user theese things are all equal: * Feature not implemented. * Feature not deployed. * Don't know about the feature. * Can't find the feature. The implication is that unless we figure out how to build, deploy and educate users we simply haven't delivered busniess value. Scary isn't it?