1. Specify and select Top Event topics to consider the most dangerous Rectangle
2.Processing causes started to build the foil, tree, considering that the top event caused what use academic knowledge, considered in logic (Logic). Only then will the correct structure and is beneficial to the application.Similar to the root of the tree
3. Basic causes is the level of the southern end of each line of the tree structure falls, cause or event (Basic basis. Fault Event) will use the symbol circular or diamond shape only
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