These are very common causes for risk management mistakes. But in essence, these mistakes are due to lack of comprehensive knowledge of risk management. Here I wanna add one more mistake that could occur in risk management, which is the overestimation or underestimation of a potential risk by misunderstanding its occurrence mechanism, possibility, and chain consequences. This mostly lead to a bad risk measurement that lead the project to failure or over budget, and cost a lot of money to cover for that unexpected risk or unnecessary risk. In my opinion, this mistake also needs to be knowingly avoided.