After a team finishes its Sprint Review, the Retrospective meeting should begin immediately.  Of course, there may be a small transition period as non-team members leave a meeting room or as the Team Members go back to their team room.  However, there should be no work on the system done between Sprint Review and Retrospective.  This quick transition between the two meetings is primarily to ensure that everyone has a clear memory of the Sprint.  If there is a gap between the two meetings it can lead to a number of sub-optimal behaviours: team members may do work without the knowledge of the rest of the team, there may be a growing desire to delay the retrospective, or even pressure to skip the retrospective.

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