A method and a system for monitoring access of a person from an exterior to an interior of a partition via a passage having an openable closed opening, using a detection device and supervision of an operator. A monitoring unit is coupled to both the detection device on the exterior, for handling in manual self-scanning procedure, and an input/output unit on the interior, for use by the operator. The monitored person handles the detection device, which transmits at least a first type handling signal, and at least a second type recognition signal to the monitoring unit. The operator rates the monitored person and transmits a third type rating signal to the monitoring unit, indicating crossing permission or crossing denial. The monitoring unit then derives an access signal from the three types of signals received from at least two sensors to allow or to deny access via the passage.