There is much debate about the difference between "potentially shippable (done)" and "shippable".
Mike Cohn states:
.. "potentially shippable" and "shippable" are not the same thing. Some large or complex projects will require the
use of "release sprint" or "hardening sprint" at the end of a release cycle (say 6 two-week sprints then a 2-week
release sprint). The release sprint is not a dumping ground for sloppy work; rather it is a place where some
hardening of the system can occur.
One thing is clear Scrum teams need to agree on their definition of "potentially shippable"
and "shippable" and to come to a shared understanding with the Product Owner.
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