Incident investigation is a process for reporting, tracking, and investigating incidents that includes a formal process for investigating incidents, including staffing, performing, documenting, and tracking investigations of process safety incidents and also the trending of incident and incident investigation data to identify recurring incidents. Students in this subject are expecting have ability to use several investigation theories such as Fault tree analysis, Event tree analysis, Sequential Timed Events Plotting (STEP), MORT, RCA, and includes the fourteen (14) others investigation methods.