The auditor obtains the description, reads it, and judges whether the in-scope parts are fairly presented in every material respect under the assertion's criteria: whether the control objectives are reasonable, whether the controls described were actually put in place, whether complementary user entity and subservice organisation controls are properly described, and whether the subservice organisation's services are properly described with the carve-out or inclusive method stated.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.