Classification of Failures (Overload failures, Manufacturing failures, Fatigue failures, Elevated temperature failures, Corrosion failures, Hydrogen damage failures. General procedure of a failure investigation: Collection of background data, preliminary examination, nondestructive testing, destructive testing. Macro and micro inspection of fracture surfaces: Metallographic and fractographic analyses, chemical analyses. Determination of fracture type. Case studies that demonstrate various types of component failures and the preventive measures.