We discussed lots of content about danger in class today. Through video, we realized that the tragedy is always associating with carelessness. Moreover, there is some situation leading to disasters. The managers should avoid overloading on the duties or make clearly priorities for the employees. Similarly, it is clear that incorrect attitude could contribute to unfortunate results. The supervisor should provide proper training to the members and developing the right attitude toward the works. The excellent business is only creating in safe environment. Thus, the mangers should take the fully responsible for offering reasonable working condition for the workers. Some cases are also discussed within class. Based on these examples, we have clear idea about how to avoid these disasters.