The out-of-the-loop performance problem (OOL or OOTL[1]) arises when an operator suffers from performance decrement as a consequence of automation.[2][3] The potential loss of skills and of situation awareness caused by vigilance and complacency problems might make operators of automated systems unable to operate manually in case of system failure. Highly automated systems reduce the operator to monitoring role, which diminishes the chances for the operator to understand the system.[4] It is related to mind wandering.[4]