Researchers will take the interactive discussion group class for six times (8-10 persons every time). During the 50-60 minutes, the facilitators will guide the trainees to understand the case vignette and focus on the key issues to discuss, to improve the ability of suicide risk identification and evaluation. Two research team workers are responsible for the facilitators, and they are both experienced in suicide prevention and clinical works. The two facilitators will guide the group in a comprehensive way and standardized maneuver. The topic of discussion is focus on a suicide case, a 47-year-old man, who is now in hospitalization of medical ward. In the content the investigators can find out there are many messages and signs of major depression and suicide behavior. Through the discussion, the investigators guide nurses to realize the suicide-related factors, and teach them to identify/evaluate the suicide risk. 10 minutes before the group, the investigators ask the trainees to read the case and answer the questions. In the next 30 minutes, the investigators start problem discussion and use three simple, convenient tools: PHQ2, simplified health scale, SAD PERSONS, to do the teaching of identification and evaluation of suicide risk. In the last 10-15 minutes, the investigators go into a conclusion, do point review and get feedback from trainees.