KASUS :
Sebuah propane condenser di PetroChina Jabung International mengalami kegagalan pada saat digunakan. Kegagalan terjadi setelah propane condenser tersebut digunakan 9 bulan. Padahal umur pakai condenser tersebut seharusnya mencapai 15 tahun.

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Often a large number of factors, frequently interrelated must be understood to determine the cause of the original failure so the analyst must consider a broad spectrum of possibilities or reasons for the occurrence. Like the great detective, the analyst must carefully examine and evaluate all evidence available then prepare a hypothesis or possible chain of events that could have caused the “crime”.