The value stream is the most important organizational construct in SAFe.
“Taking a systems view of value delivery" means understanding all the steps from ideation and feature approval to development, through deployment, all the way to release. The total average time for all these steps, including the delay times, is the average time to market for any new feature."
Value stream mapping is an analytical process teams can use to ﬁrst understand, and then improve, time to market.
The book "Lean Software Development" recommends using Value Stream Maps to find waste in the Software Development LifeCycle.
KPI: Efficiency: Touch Time / Delivery e.g. 2 months/21 months = 9.5% Efficiency