Analysability asks how much effort it takes to diagnose a defect or understand a proposed change. A measure relates the effort observed to the changes or defects examined. This is an effort property with structural proxies. The best evidence is the time from a defect report to a located cause, or the time from a change request to an agreed impact assessment. The proxies, such as size, nesting or documentation coverage, are useful only if they are validated against that effort. The measure should use a sample of real changes, not a synthetic exercise, and it should name the experience of the people doing the work.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.