This study intends to describe, explain and evaluate fraud prevention system of a state owned bank, namely PT Bank X (Persero) Tbk. Exploiting a case study method, researchers try to investigate events in their natural contexts. Data were collected mostly by semi-structured interviews and direct observation while one of the researcher was doing on the job training at the bank for four months from 2010 to 2011. Therefore, researcher’s own experience and perception during the field observation and interviews will influence the research process. The result shows that the bank has successfully implemented three phases of fraud prevention system – detection, investigation and prevention. The interesting finding is that most fraud cases were detected by accident, while internal control, internal audit and whistleblower systems that supposed to be the most important devises to detect fraud were left behind. Cultural factors such as paternalism might explain the phenomena. Keywords: fraud prevention system, case study, bank
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