Quality is not the responsibility of testers alone, but of the whole agile team. It should be a shared mindset and definition agreed upon by the team. Several techniques can help build quality in, including defining acceptance criteria through conversations between product owners, developers and testers; practicing test-driven development; and ensuring story kick-offs and "shoulder taps" between team members to facilitate collaboration and catch issues early. The document discusses the importance of collaboration, automation, and not trading off quality to deliver features quickly.