Dynamic Risk Assessment in Australian Workplaces

A dynamic risk assessment (DRA) is a real-time mental or verbal evaluation of hazards and risks carried out by a competent worker at the point of work, when the work environment or task conditions are unpredictable, rapidly changing, or cannot be fully anticipated in advance. Unlike a static or pre-planned risk assessment — which is prepared before the work commences by an assessor who has time to consider the hazards systematically — a dynamic risk assessment is conducted in the moment, often under time pressure, by the worker or crew directly exposed to the hazard.

Dynamic risk assessment is a concept most commonly associated with high-consequence, variable-environment industries: emergency services (fire, ambulance, police), utilities field work, construction in complex or live environments, arborist and tree services, and civil infrastructure maintenance. In these settings, a static pre-task risk assessment may identify the predictable hazards associated with the type of work, but it cannot anticipate every condition the worker will actually encounter — a newly exposed underground service, a structural failure discovered during demolition, a change in weather that alters the stability of an excavation, or a patient in an unexpected medical emergency scenario.

In Australian WHS law, the obligation to manage risks is continuous and is not discharged by completing a pre-task risk assessment. Section 17 of the WHS Act 2011 requires PCBUs to manage risks so far as is reasonably practicable throughout the course of the work, not merely at the point of planning. Dynamic risk assessment is the mechanism through which that ongoing obligation is met in variable-environment work.

Dynamic risk assessment is not a substitute for pre-task risk assessment — it is a complement to it. The two approaches address different phases of risk management and different categories of hazard.

A static, pre-planned risk assessment is appropriate for work that is predictable, routine, and performed in a stable, well-understood environment. For example, a risk assessment for a regular maintenance task on a fixed piece of production plant, performed by a trained maintenance technician using established procedures, can be completed comprehensively before the work starts. The hazards are known, the controls are established, and the conditions are unlikely to change significantly.

Dynamic risk assessment is required — or is the primary risk management tool — in the following circumstances.

**Unpredictable or rapidly changing environments.** Emergency response workers, field service technicians, and workers on live construction or civil maintenance sites regularly encounter conditions that could not be fully anticipated in a pre-task assessment. The DRA process allows them to pause, assess the changed conditions, and adjust their approach before continuing.

**Non-routine or first-time tasks.** When a worker is asked to perform a task they have not performed before, or in a location they have not previously assessed, a DRA fills the gap between the generic pre-task assessment and the actual conditions encountered.

**After a change in conditions.** Whenever conditions change during a task — a change in weather, a structural discovery, a new hazard introduced by another work party — the ongoing DRA process requires the worker to stop, re-assess, and determine whether it is safe to continue.

**In conjunction with Take 5 and pre-start checks.** Many Australian industries use a Take 5 (a five-step immediate hazard assessment) as the trigger for a DRA. The Take 5 prompts the worker to stop, think about the task, identify the hazards, assess the risks, and implement controls — before commencing work and whenever conditions change.

Several structured frameworks have been developed to support dynamic risk assessment, particularly in the emergency services and utilities sectors. The most widely used in Australia are IIMARCH, LACES, and the SAFE-T model.

**IIMARCH** is used extensively by Australian fire services, state emergency services, and some utility field work organisations. The acronym stands for: - **I**nformation — what do I know about the situation? What do I not know? - **I**ntention — what is the objective? What am I trying to achieve? - **M**ethod — how will I achieve the objective? What approach will I use? - **A**dministration — what resources do I need? Who is responsible? - **R**isk — what are the hazards? What is the level of risk? What controls will I apply? - **C**ommunication — how will the crew communicate? What are the warning signals? - **H**umanities — who else is involved? What are the welfare considerations?

In field work contexts, IIMARCH is often compressed to a rapid three-part mental assessment: What are the hazards? What is the risk? What will I do about it?

**LACES** is used in some emergency services contexts: - **L**ookouts — designate someone to monitor for changing hazards - **A**wareness — maintain situational awareness throughout the task - **C**ommunications — establish communication channels and signals - **E**scape routes — identify and maintain exit paths - **S**afety zones — identify places of refuge if conditions deteriorate

**Take 5 (STOP, THINK, IDENTIFY, ASSESS, CONTROL)** is widely used across Australian construction, mining, utilities, and field services as a simple, memorable framework for immediate pre-task hazard assessment. It is not a dynamic risk assessment methodology per se, but it triggers the DRA process at the point of work and whenever conditions change.

One of the practical challenges of dynamic risk assessment is documentation. A pre-planned risk assessment is naturally documented — the assessor has time to complete a written form before the work starts. A dynamic risk assessment, conducted in real time under time pressure, cannot always be documented contemporaneously.

The approach to documentation varies by industry and by the formality of the DRA process used.

**Formal verbal DRA:** In emergency services, a formal verbal briefing (using IIMARCH or a similar framework) is conducted before the crew commits to a course of action. The incident controller's log or the incident report records the key elements of the decision. This verbal assessment is legally recognised as evidence that a risk management process was followed.

**Pre-task checklist with DRA prompts:** Many organisations use a pre-task checklist that includes both pre-planned hazard identification and a section for recording any additional hazards identified at the point of work. Workers complete the checklist before starting and add any DRA findings discovered during the task. This hybrid approach provides a written record without requiring a full formal assessment to be repeated.

**Post-task record:** In some frameworks, the worker records the DRA findings at the end of the task or shift in an electronic field log or incident reporting system. This provides a retrospective record but does not substitute for the real-time decision-making process.

**Electronic DRA tools:** A growing number of field service organisations use mobile applications that prompt workers through a DRA checklist at the point of work and record the results digitally. Some applications also use GPS to attach location data to the assessment record.

Regardless of the documentation method, the key principle is that the worker's DRA decision — what hazards were identified, what risk was assessed, and what controls were implemented — must be traceable in the event of an incident. Our CIH consultants can advise on the most appropriate DRA documentation approach for your workforce and industry.

A dynamic risk assessment is only as effective as the worker conducting it. Unlike a pre-planned risk assessment, which can be reviewed and corrected by a safety officer before work commences, the DRA relies entirely on the knowledge, judgment, and situational awareness of the worker in the field. This places a significant training obligation on the PCBU.

Effective DRA training covers the following elements.

**Hazard recognition.** Workers must be able to identify the specific hazards they are likely to encounter in their work environment — not as an abstract list, but as real conditions they will recognise in the field. Training should use photographs, site visits, and incident case studies to build the worker's hazard recognition library.

**Risk evaluation under time pressure.** The ability to rapidly estimate likelihood and consequence, and to make a sound control decision in real time, is a skill that improves with practice. Simulation exercises and scenario training help workers build this capacity.

**Application of the hierarchy of controls in real time.** Workers need to internalise the hierarchy of controls so that their instinctive response to a hazard is to eliminate or isolate it, not to reach for PPE. Training should reinforce this hierarchy through examples relevant to the worker's specific tasks.

**Stop-work authority.** Workers must understand and exercise their right to stop work when they assess the risk as unacceptably high. This right is explicitly supported by Section 84 of the WHS Act, which provides that a worker may cease work if they have a reasonable concern about a serious risk to their health or safety. Training must reinforce that stopping work in response to a DRA finding is not a disciplinary matter but a safety obligation.

**Communication of DRA findings.** Where the DRA identifies a hazard that is beyond the worker's authority to control — for example, a structural defect requiring engineering assessment, or a chemical spill requiring specialist response — the worker must know how to communicate the finding promptly to the appropriate person.

The choice between a static pre-planned risk assessment and a dynamic real-time assessment — or a combination of both — depends on the predictability of the work environment, the severity of potential consequences, and the competency of the workforce.

For high-consequence, predictable work — work in a defined, stable environment with known hazards and established controls — a comprehensive static risk assessment prepared in advance by a qualified assessor provides the strongest risk management foundation. The static assessment captures the full hazard profile, applies the hierarchy of controls rigorously, and creates a documented record that workers can reference and supervisors can monitor.

For high-consequence, variable-environment work — field service, emergency response, complex maintenance in live environments — the static assessment sets the baseline and the DRA manages the residual uncertainty. The pre-planned assessment identifies the predictable hazards; the DRA addresses the conditions that could not be anticipated.

For lower-consequence routine work, a pre-task checklist (often five minutes or less to complete) provides adequate structure for the hazard assessment without requiring a formal risk assessment document. The Take 5 format is designed for this purpose.

In practice, many Australian organisations use a three-tier system: a comprehensive static risk assessment for new tasks, work environments, or significant changes; a pre-task checklist or SWMS for routine high-risk work; and a DRA supported by a Take 5 for day-to-day variable conditions. Our CIH consultants can assist in designing a risk management framework that is proportionate to your workplace hazard profile and workforce characteristics.

Australian WHS regulators recognise dynamic risk assessment as a legitimate and necessary element of risk management in variable-environment industries, but do not treat it as a substitute for pre-planned risk assessment where a pre-planned assessment is practicable.

Safe Work Australia's How to Manage Work Health and Safety Risks Code of Practice notes that risk assessment can be a complex process involving detailed analysis, or it can be a relatively simple and quick process, depending on the nature of the hazard and the level of risk. The Code explicitly recognises that the type and depth of risk assessment should be proportionate to the hazard.

State regulators have published specific guidance on DRA for industries in which it is the primary risk management tool. WorkSafe Victoria's guidance on emergency services notes that IIMARCH-based dynamic assessments are consistent with the WHS Regulation requirements. SafeWork NSW's guidance on utility and field services work similarly recognises DRA as an acceptable approach for work in variable environments.

However, where a static risk assessment is practicable — for example, before a planned maintenance task on a utility asset — regulators expect that assessment to be completed, and will treat the absence of a pre-planned assessment as a compliance failure even if the worker conducted a DRA at the point of work. Dynamic risk assessment does not exempt a PCBU from the obligation to plan and assess foreseeable risks before the work commences.

**Is dynamic risk assessment a legal requirement in Australia?** The WHS Act requires risks to be managed continuously throughout the course of work, not only at the planning stage. In variable-environment industries, dynamic risk assessment is the mechanism through which this continuous obligation is met. While the term 'dynamic risk assessment' does not appear in the WHS Act or Regulation, the obligation it addresses — managing risks that arise or change during the course of work — is clearly established in law.

**Can a DRA be conducted without any training?** No. An untrained worker conducting a mental DRA is simply guessing. Effective dynamic risk assessment requires the worker to have a well-developed hazard recognition library for their work environment, an understanding of the hierarchy of controls, the judgment to assess likelihood and consequence rapidly, and the authority and confidence to stop work when the assessed risk is unacceptable.

**How do I document a DRA conducted in the field?** The most practical approach for most field work organisations is a hybrid pre-task checklist that includes both pre-planned hazard identification and a section for recording DRA findings. Electronic field logs or mobile applications that prompt workers through a DRA checklist and record the results digitally are increasingly common in utilities and construction.

**Does a DRA replace the need for a SWMS on a construction site?** No. A SWMS is a mandatory legal requirement for high-risk construction work under the WHS Regulation, regardless of what other risk assessment tools are used. A DRA complements the SWMS by managing hazards that arise during the work that were not anticipated at the time the SWMS was prepared.

**What is the relationship between Take 5 and dynamic risk assessment?** A Take 5 is a structured prompt for a dynamic risk assessment — it provides a simple, memorable framework (Stop, Think, Identify, Assess, Control) that triggers the DRA process at the point of work. Not all DRAs use the Take 5 format, but all Take 5 assessments are a form of DRA.