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The video is the second part of the accident investigation series and explains the basic causes that lead to accidents. The subdivisions include personal factors and work factors, and each subdivision is explained in the Frank Bird accident causality model, where personal factors are subdivided into don't know, don't want to and can't on the one hand and on the other hand are work factors that obey the subdivisions of engineering, wear, maintenance, organizational problems, etc. Finally, there is the root cause, which is the cause of all the basic cause factors.