The document discusses defining the "Definition of Done" (DoD) which establishes the quality standards and activities required to consider a user story or increment of work complete. It notes problems that can occur without a DoD such as technical debt, unpredictable delivery dates, and overcommitting work. The document recommends that the team, including the product owner, define the DoD during backlog estimation and that the definition evolves over sprints based on the team's experience. It provides some examples of DoD criteria for user stories and sprints.