The study is a randomized controlled trial. The sample will be consisted of 120 people, with half of them allocated to the intervention group and another half allocated to the control group. Therefore, the sample will be distributed into experimental group and control group equally and randomly. After receiving approval from the Ethical Review Committee, the investigators will start recruiting people to attend the intervention, "interactive discussion group" (IDG), the investigators aim to discuss the concept of suicide risk identification and evaluation as well as investigate the impact of such an intervention. The investigators have developed a standardized teaching program (the IDG and suicide gatekeeper course for nurses) as our intervention. Moreover, before starting the intervention, the investigators will have three focus groups in the pilot study in order to recruit clinical nurses' perspectives on the issue of the study and their opinions of the study tool. Depends on their opinions, the investigators will revise the teaching materials and assessment tools, and evaluate the feasibility of putting the IDG into practice. Next, the experimental group will take one suicide gatekeeper course and the IDG discussion twice, and the control group takes one suicide gatekeeper course. The investigators will do the baseline measurement and outcome measurement to evaluate the effects of intervention. The research methods and rationale are described in details below.