... That's why Panasonic's engineers can forecast with pretty darn good accuracy when the camera will be ready to ship. They know there will be some problems at first, they know the problems won't be too severe and they know the process of addressing those problems once they are discovered. ...
Indeed, before a project begins and as it develops, project engineers/managers now routinely predict lines of code required, how many bugs will be detected, how many will be fixed, and how many will remain in the release with great accuracy.