Chapter 8 gave an overview of the iteration process, tasks, and artifacts for the team as a whole. This chapter contains a detailed look at the work of a Business Analyst (BA). It shows how the BA uses inputs from other team members and produces outputs for them. This chapter compares use cases and user stories, and describes a guideline for how agile BAs may do their job. It should help other team members understand the BA on their team, and possibly allow novice BAs working in an agile team to perform the business analysis and requirements function better. If the team does not have a BA, then this chapter may help others complete the requirements-centric tasks normally performed by the BA.