In the Roman Empire era, milestones were used by the Roman road builders to indicate how far a particular place is along the road from the center of Rome (the ‘Golden Milestone’). The Roman Empire was vast stretching all the way to Britain and to Asia… having these milestones help travelers in their journey as they go from one milestone to another… helping them confirm that they are on the right path towards their destination.

The ‘Golden Milestone’ is the inspiration of the ‘Zero Milestone’ at Washington D.C.

In other words, Milestones are installed to provide reference points along the road. This can be used to reassure travelers that the proper path is being followed, and to indicate either distance travelled or the remaining distance to a destination.
You might ask, “what does this ‘Milestone’ have to do with Lean Agile?”
To be continued…