Velocity in Kanban:
It is beneficial for Kanban teams to have a notion of delivery cycle and velocity, at least from reporting & analytical points of view.
Velocity is the average amount of work a team can complete in a delivery cycle. A delivery cycle is a constant period of time like a week, two weeks, or a month.
By knowing their velocity, a team can predict how much work they are able to deliver in the future. And predictability is the primary outcome of our efforts regarding process setup.