Introduction.- Related concepts in reliability modeling of warm standby systems.- Reliability of -out-of- warm standby systems.- Reliability of demand-based warm standby systems.- Reliability of warm standby systems with imperfect fault coverage and switching failure.- Optimal working sequence in a 1-out-of-n warm standby system.- Reliability Evaluation for Demand-based Warm Standby Systems Considering Degradation Process.- Reliability of demand-based...