The document discusses defining what "done" means for software development work. It argues that agreeing on a definition of done provides clarity for estimating work, focusing efforts, and knowing when work is ready to deliver. If done is not clearly defined, work can accumulate without notice and stakeholders may be confused. Done should define when work is potentially shippable. The team should define done, with input from the product owner and stakeholders. The definition can evolve over time as the team's capabilities change. Examples of done criteria include code passing tests, being deployable, and meeting acceptance criteria.