Inclusivity asks whether the product can be used by people with the widest range of needs, characteristics and capabilities. A measure relates successful task completion across user groups to the groups studied. The defined term accessibility sets the frame: the widest range of user needs, characteristics and capabilities, not a single disability category. Inclusivity is measured by whether people can complete tasks, not by whether a page passes a scanner. The two are related and not the same. The population has to include people with visual, motor, cognitive, hearing and situational limitations, and the measure should record which groups were represented. A result from one group is a result for that group.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.