Teams have understanding of priorities and are able to use the Epic Roadmap to have a continuously current view at least 6 months out. Product Line Teams are able to use this horizon to know what is coming up for the next release and are able to refine the Features to meet expectations. Delivery Teams are able to work deeper into their backlog and refine work further in advance.
Delivery Teams should have time to do research spikes in order to help Product Line Teams come up with the best solution.
Teams will be using the knowledge of the Roadmap, Strategic Alignment and refined work to write better Features and User Stories. This process is now becoming more of an art than a science; teams are fully functioning and know what they need from each other.