W451 GroupWBathtub curveWCascading failureWFailureWFault tree analysisWKaplan–Meier estimatorWMaintenance (technical)WMulti-link trunkingWPEMAC Asset Management Association of CanadaWProceedings of the Institution of Mechanical Engineers, Part OWRedundancy (engineering)WReliability block diagramWRepair kitWSafety engineeringWSeason crackingWSingle point of failureWStress–strength analysisWStriation (fatigue)WStructural reliabilityWTechnical failureWTriple modular redundancyWValue tree analysis