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With the explosive growth of the population on Earth, the continuous development of science and technology, human economic activities have become increasingly frequent, more complex structures, have been expanding, leading to increasing instability of human society. Intertwined with each other complex human social activities coupled with natural disasters, causing a chain reaction, extremely rapid development and enormous destruction characteristics of major emergencies occur. Disposal of such huge time constraints, the difficulty of major emergencies, the need for extensive mobilization and efficient organization, multi-region, multi-level, multi-sectoral, multi-disciplinary organization of human, material and financial resources, the conventional method of coping or existing response plans difficult to use directly. In other words, the response to major incidents, the existing human knowledge has been unable to fully understand the incident and the mechanism of evolution, unable to grasp the overall trend of events change the response of the human past experience is no longer applicable, not readily available and effective mode of action . The major emergencies improvisation decision will dispose of major emergencies, to provide a new perspective and ideas. Starting from the quick disposal of the point of view of the major emergencies, basic theoretical basis for organizational improvisation, impromptu decision-making of major emergencies, in-depth study on the basis of the research with improvisational decision-making on major emergencies, and come to a different level decision-making , events at different stages of the optimal mode and its impact mode selection factors. The main contents are as follows: First, progressive, and comparative analysis of the characteristics of major emergencies identified; studied and summarized the meaning and the main features of the general decision-making, emergency decision-making with improvisational decision-making based on decision theory, the need for impromptu decision-making in the environment of major emergencies; This section also analyzes the improvisation in the the events different stages and at different levels of decision-making under conditions the frequency and degree of importance of the decision-making applications. Secondly, on the basis of organizational improvisation, organizational culture, organizational memory, organizational flexibility, leader style, characteristics of the members of the organization, resources six impact factors be improvised decision-making model assumptions. And on in combing the basis of the system of decision-making mode, summed up the decision-making mode impromptu decisions for major emergencies. Then, at home and abroad in recent years major emergencies, such as \application mode and the pros and cons of this part of the purpose is to explore the major unexpected events complex, uncertain scenario, which factors be impromptu decisions have an impact, and come to the decision makers at different levels of decision-makers in the different stages of the event, should be the choice of a decision-making mode in order to respond effectively to major emergencies evolving. Finally, the the improvised decision about major emergencies factors based on six influencing factors of \On the basis of the above research, the end of this part from a sense of crisis, decision-making mode for the government to respond to major emergencies to make some policy recommendations. Through this study, the authors expect to correct quickly deal with major emergencies in the future to provide new ideas, to achieve the purpose of reducing disaster losses to a minimum.
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