Calibration and traceability requirements shall be defined well enough to keep reporting of results consistent. For quantitative methods that measure an analyte, this means requirements for calibration and metrological traceability; for qualitative methods, and for quantitative methods that measure a characteristic rather than a discrete analyte, it means stating the characteristic assessed and what is needed for the results to be reproducible over time.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.