**2. Background**

A definition of suicide from [12] is death from injury, poisoning, or suffocation in which there is evidence that the injury was self-inflicted and that the deceased intended to kill him/ her-self. The generation of suicidal behaviour is from suicidal ideation, which means any self-reported thoughts of engaging in suicide-related behaviour. Therefore, everyone who commits suicide will have suicidal ideation before s/he commits suicide;so suicidal ideation can be regarded as the motivation for suicide.

As the official report from the World Health Organization (WHO) [18] said that the world almost one million people die from suicide every year. That is, one death every 40 seconds in 2011. Surprisingly, a global map of suicide rates is drawn by the most recent year availa‐ ble as of 2011, which is also provided by the WHO, discloses that the suicide rate is beyond 16 per 100, 000 people in some countries. That is, one suicides oneself every 40 seconds. These countries, for example, at least include Lithuania (31. 5), South Korea (31. 0), Japan (24. 4), Russia (23. 5), Finland (18. 3), Belgium (17. 6), France (17. 0), Sweden (15. 8), South Africa (15. 4), and Hong Kong (15. 2) [20]. Therefore, the suicide behaviour is one of the im‐ plicit social problems for many countries.

Based on the above, it is necessary to reduce the suicidal ideation in order to decrease the occurrence of suicide. Shneidman, *et al.* [16] proposed a three-level prevention model to do exactly that. The model is divided into three program response categories: prevention, inter‐ vention and postvention. Within this three-level prevention model, prevention is to increase the protection factor and decrease the risk factor. The research team tries to focus on the sec‐ ond level of the three-level prevention model and analyses, whether moving SP to SN can elicit the high-risk group so that early detection can lead to early treatment.
