conditions model when conducting an accident investigation. A multipie causation theory is used because many times accidents have many events that occur that result in an accident. identifying all the causes of an accident is crucial to correct the existing problems to prevent future accidents. Finding unsafe acts will reveal what happened, but multiple causation theory will explain why it happened. Just looking for unsafe acts and conditions more signicant issues may be overEooked. When using this theory an analytical approach and technique must be used. An example of a multiple causation theory is Management Oversight and Risk Tree {MORT} Root Cause Analysis [Oakiey, 2012}