Sometimes it could not be calculated because of complex conditions. The probability of accident occurring equals the sum of the probabilities of each path.
The probability of each path equals products of an event occurring probabilities since initial event. After designing the event tree, you need to find types of an accident occurring path and solutions to accident prevention. For this reason, before drawing the event tree, you should analyze the possibility of each process and probable status of each path in accordance with characteristics and objectives of the event. Qualitative analysis process occurs along with designing process. Through the qualitative and quantitative analysis of the event tree, users can find the main reasons of accidents and provide reliable solutions so as to reach the purpose of speculating and preventing accidents. This approach uses a tree diagram called "event tree" to describe the logical relationship between probable accidents and potential reasons. Originating from decision tree analysis, event tree analysis becomes an accident-cognition method of deducing possibilities and outcomes in a chronological order. It is used to determining the success paths and providing solutions to avoid dangers and accidents. Event tree analysis is applicable to risk assessment and safety system engineering.
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