Explore the people, objects, environments and management and on the safety factors found in the causes of the accident, people are the most important. People here include not only employees, but also the leadership. Analysis of the cause of the accident, tended to be concentrated at the surface! In addition to the analysis of systems, technology and equipment, and for the people, only viewed as an operator, only the pursuit of normal # compliance with the rules! Analysis, but not deep. Does not take into account people in addition to knowledge, technology, rational, emotional and non-intelligence side, but added this kind of analysis and, in the "culture" studyof subtle levels.