Part 1 - Hierarchy of Controls. Part 2 - Probability Scale & Severity Scale. Part 3 - DVD. Part 4 - Support Materials on Computer Disk. It is critical to understand the anticipated level of risk associated with the handling and use of all types of chemicals. This DVD looks at hazard identification; assessing the degree of risk; risk control measures; and setting priorities for risk management. The programme is filmed in a variety of locations with practical demonstrations of the process. 15 minutes.