It is important to assess the risk a client poses to themselves or others in the informal assessment interview (described in Chapter B3) and to monitor this throughout treatment. This chapter focuses on two areas of risk: suicide and domestic or family violence. It should be borne in mind, however, that there are several other areas of risk that should be assessed and monitored throughout treatment, including self-harm, homicidal thoughts/attempts, and child welfare, as well as the evaluation of safety regarding sexual practices, injecting practices, and other high-risk behaviours as appropriate. In any situation where the risk of harm to self or others is perceived to be significant, other services may need to be enlisted (e.g., police, ambulance, crisis teams).