Clause 8 explains how the two organizations involved, the one that launched the project and the project organization itself, should learn from projects. Each should use measurement results and analysis of data from project processes, and use ways of correcting, preventing or reducing unwanted effects (ISO 9001:2015, clause 10), so that current and future projects keep improving.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.