Preventing accidents and incidents depends on gaining a maximum amount of information about the situations in which these events occurred and about what actions were taken by the people involved in these events. Therefore, we developed a hearing investigation technique. And as a result of having tried this technique, we confirmed that we could collect more the data about the background factors than before. Moreover, we developed an educational program that consists of a five-step of exercise and explanation. And we confirmed that the participant's investigative attitude becomes proper.