Previous chapters determined that when there are many uncertainties about software requirements a healthy team with a shared vision, a meaningful common goal, and a set of high-level features are all necessities. This creates a stable foundation to guide the team. Expressing the product vision is only the first step in a larger process that creates successful software. For software to truly come to life, the next step is to learn how to react to stakeholders’ evolving requirements. First, you apply a trial-and-error method through short feedback loops, and second, you focus on stakeholders’ desires and requirements. This is the purpose of this chapter.