The particle-concentration cleanliness class of a room or zone is defined for at least one of the three occupancy states: as built (installation complete, no equipment, materials or people), at rest (installation complete with equipment installed and operating as agreed, no people) or operational (functioning as specified, with the agreed number of people working as agreed).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.