The ways that people and their performance can affect railway RAMS, positively and negatively, are recognised and handled across the whole life cycle, covering not only the in-service phase of operating, maintaining and monitoring performance, but every phase (lapses in early phases become systematic failures in service), with the precise influence determined for the application and analysed with suitable methods.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.