Control of selected Hazard Risks 245 f I g u r E 23.1 Impact Illustration of control effect Control 1 Control 2 Likelihood Risk treatment is sometimes referred to as risk control, and it includes the selection and implementation of actions to reduce risk likelihood and risk impact. The types of controls described in Chapter 22 should be considered in turn when deciding the nature and extent of risk control activities that should be implemented. When reasonably practicable, it is obvious that preventive controls should be introduced as the first option. If prevention is not possible, then corrective controls should be introduced to minimize the likelihood and impact of an adverse event. When risks have been prevented and corrected to the greatest extent that is cost- effective, the organization should then consider directive controls that are designed to direct the actions of people involved in the management of that particular risk. Finally, and in addition to the three other types of controls, the implementation of detective controls may be appropriate. Detective controls are used in a wide range of applications, including health and safety. The examples in the sections below cover the main hazard risks that are likely to be of concern to an organization, as outlined in Table 21.2. In each case, the section sets out to describe what can go wrong in relation to the hazard, and the considera- tions and the issues that need to be evaluated. The control options that are available in relation to that particular risk are considered, followed by consideration of the controls that are necessary and appropriate.