Project Manager Question:

To get the customer feedback early. Iterations allow you to manage risk sooner—you do not have to build the whole product to find out if you can meet a particular specification.

Another benefit of continuous feature delivery is that for some products, software being a good example, incremental releases can provide early benefits. Rather than wait 12 or 18 months for new software features, incremental delivery can provide quarterly or even more frequent ones. Incremental releases can favorably alter ROI calculations because they allow product managers to address opportunities that would be lost in 18 months. However, even though some products can be developed iteratively using simulations or prototypes, they are very difficult to release incrementally. As the battle over Web browsers showed in the late 1990s, customers often can't assimilate new product releases every three to four months.