If the Definition of Done is enhanced over a period of time, what happens to the previously completed items (Increment)?
The DOD is applied to the increment and you will have only one increment at any point and that increment should meet the then DOD. So if the DOD is enhanced to improve quality, the Development team may plan their work accordingly to ensure the increment meets the DOD including the items that were completed earlier. In that case they may take less items and focus on making sure the old items meet the current DOD.
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