Understanding Risk Controls
When it comes to controlling risks in the workplace, it’s pretty easy to find a solution to most issues. What is harder, is ensuring that it is a practical and workable solution. The two key questions you need to be able to answer are:
- Is this control practicable? ie, is the effort and scope of the solution in line with the potential for injury or illness?
- Is this the best control that I can come up with? Is there another control that will provide a better level of safety protection?
The first question can only be answered on a very specific, case-by-case basis. No-one but you knows the risks inherent in your operations, how likely they are to occur, and what harm is likely to befall people encountering these risks.
The second question is quite simple in comparison – we must always utilise the Hierarchy of Controls.
Why use the Hierarchy of Controls?
The Hierarchy of Controls consists of five (or six – more on that later) separate types of control measure, in order of effectiveness.
When identifying a safety concern in your workplace, if your go-to response is “let’s develop a procedure and hand out some PPE”, then you’re doing it wrong, plain and simple. You are focussing on the final two controls, rather than the more effective methods at the top of the Hierarchy.
In fact, the WHS Regulations are very clear on the matter (See Regulation 36 at the AUSTLII website) – you must first attempt to Eliminate the risk. Only if this is not practicable, should we then consider Substitution, isolation* and Engineering controls. Finally, if the risk is still present, we can consider Administration and PPE controls.
(*Isolation is the “missing” sixth control type referred to earlier. It is often combined with other Engineering controls, and may or may not appear as a separate control type in the Hierarchy).
Understanding the Hierarchy
If we are to effectively consider the Hierarchy of Controls in our Risk Management processes, then we must understand what each level of the Hierarchy is all about.
Elimination
If an item of equipment is not utilised, it cannot cause harm. If a certain chemical is not present on site, then it cannot be spilled. Elimination is the simplest control measure to understand, as well as the most effective. We cannot be harmed by a situation that cannot exist.
Substitution
Substitution requires “swapping” one situation for another. It may be swapping one chemical for another, changing package sizes to address manual handling concerns, or replacing old, worn or damaged equipment with new items.
Of course, the entire point is to ensure that the new item has a lower inherent risk than the item that is being replaced. If this is not the case, then you are clearly wasting your time.
Engineering
Engineering controls (including Isolation) require a physical change to be made to the item or situation. Common examples include installing guarding on machinery, relocating noisy pumps away from work areas, and providing lifting equipment for manual handling
Administration
Administrative controls include Information, Instruction, Training and Supervision. Development of a Standard Operating Procedure is an example of an Administrative control. Administrative controls are essential (imagine trying to run a business without any form of staff training!), but they need careful management – more on that later.
Personal Protective Equipment
PPE is unique, in that it makes no attempt to address a hazard directly. Instead, it seeks to protect the individual once the hazardous situation has already occurred. Wearing glasses is not going to prevent sparks being created during a grinding job, but it should prevent you suffering an eye injury. Similarly, the use of gloves will not prevent a chemical spill, but hopefully you will not suffer any nasty chemical burns.
But Why is it so important?
With an understanding of what each of these types of controls are, hopefully you can see why utilising the Hierarchy of Controls is so critical. If not, let’s make it clear:
The more your controls rely on human behaviours, the more prone to failure they are
Elimination is almost infallible – you can’t be hurt by a situation that doesn’t exist.
Substitution and Engineering are making a physical change to the situation or process. A well-designed control will prevent accidental exposure, but the truly determined individual may still find a way to circumvent guarding or climb a fence.
Administration and PPE controls are very useful and important, but are incredibly difficult to rely upon. Their success relies to a significant degree on human behaviours – things that require a conscious effort.
- I may have been away for that training session. Maybe I chose to ignore my training. Perhaps I honestly don’t remember the method I was instructed in.
- The documented procedure may be out of date. It could be that the procedure was written by someone who didn’t know the process itself. Maybe I think I know better, and choose to go about it my own way.
- My PPE is on the other side of the factory, and the job won’t take long. It’s really hot today, and my safety glasses are just going to fog up with sweat. The gloves I’ve been provided are stiff and uncomfortable, I’ll get the job done quicker if I don’t use them.
All levels on the Hierarchy of Controls have their time and place, but you need to ensure you are at least considering each level whenever you are selecting a new control measure.
And don’t forget, the goal is to reduce risks “as far as reasonable practicable” – not “pick a control measure and move on”. Once you have identified a control, you must still consider the remaining levels in the Hierarchy to determine if there is anything further that can be (reasonably practicably) done to control the risk.
The Hierarchy of Controls is not a magic bullet, but it is an essential tool in effective Safety Management.


![images[2]](http://regionalsafety.com.au/blog/wp-content/uploads/2014/04/images21-150x150.jpg)




