Closing
In this chapter I discussed the crucial role of the product backlog in achieving fast, flexible value-delivery flow in the presence of uncertainty. I emphasized a number of structural and process issues surrounding the product backlog, such as what types of items are in the product backlog and how to groom the product backlog to obtain several desirable product backlog characteristics. I concluded by addressing the issue of which and how many product backlogs we should have. In the next chapter I will discuss how product backlog items are estimated and how those estimates are used to measure velocity.