On the top layer there is rapid change. On the bottom, change happens at a glacial pace. It’s this combination of everything, from seconds at the top, to millennia at the bottom, that give resilience to the system.
A key concept to this is that each layer has to respect the pace of another.
Source: The Fast and Slow of Design
“Product owners prove actual benefits either with data from A/B testing, analytics, user surveys, etc. or with feedback from business. This ability is dependent on good engineering capability to develop and release frequently in small chunks and good analytics capability to determine delta changes in adoption, conversion etc.”
Original source: Products Over Projects