Description: actual reliability of an object, taking into account the modes of operation, operating conditions and any preventive maintenance measures carried out; Name: reliability of operation
Description: Actual reliability of an item considering operating modes, operating conditions and possible preventive maintenance actions carried out ; Name: Operational reliability
Description: variable quantity, which is not influenced by the control but is introduced into the control system from outside with the aim of making the final controlled variable follow it in a given relationship; Name: command variable