Causation & Contributing
Factor Analysis
Independent expert analysis of causation and contributing risk factors in workplace incidents. Root cause analysis methodology applied to legal proceedings involving WHS obligations across Australia.
Causation in WHS Legal Matters
Causation is a central issue in most workplace injury and public liability proceedings. The court must be satisfied not only that a duty holder failed to meet their WHS obligations, but that the failure caused or contributed to the harm suffered by the plaintiff. This requires expert analysis of the connection between the duty holder's conduct and the incident outcome.
A WHS causation analysis identifies the factors that caused or contributed to a workplace incident, assesses the role of each factor in producing the outcome, and links those factors to the obligations of the relevant duty holders. The analysis explains, in terms accessible to a court, how the incident came about and what could have prevented it.
This type of expert opinion is used in both plaintiff and defendant proceedings. For a plaintiff, it supports the argument that a failure in the duty holder's safety systems contributed to the incident. For a defendant, it can identify factors outside the duty holder's control or demonstrate that the incident was not a foreseeable consequence of any failure.
Material Contribution to Risk
In Australian negligence and workers' compensation proceedings, the causation question is whether the defendant's breach materially contributed to the risk that resulted in the plaintiff's harm. This does not require proof that the breach was the sole cause. It requires proof that the breach made a real contribution to the risk.
Where there are multiple contributing causes, the expert analysis identifies each contributing factor, assesses its relative contribution to the incident and links each factor to the conduct of specific duty holders. This assists the court in understanding the causal picture as a whole.
Causation analysis is frequently instructed together with a breach analysis and liability assessment. Both opinions are commonly delivered in a single expert report.
Root Cause Analysis Methodologies
Karim applies established root cause analysis methodologies drawn from incident investigation practice. These methodologies are adapted for use in legal proceedings to provide a structured and defensible account of how the incident occurred.
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5 Whys Analysis
A sequential questioning technique that traces the chain of causation from the immediate cause of the incident back through contributing causes to the root causes. Each level of causation is identified and linked to specific failures in the WHS management system or duty holder conduct.
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Fishbone (Ishikawa) Analysis
A structured cause and effect analysis that maps contributing factors across categories including people, equipment, procedures, environment and management systems. The fishbone structure assists in presenting a complex multi-factor incident in a way that is accessible to a court.
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ICAM Analysis
The Incident Cause Analysis Method (ICAM) identifies absent or failed defences, individual and team actions, task and environmental conditions, and organisational factors. This methodology is particularly suited to complex incidents in high-risk industries where multiple organisational failures contributed to the outcome.
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Bow Tie Analysis
A risk-based model that maps the threats and consequences of a specific hazard, with preventive controls on the left and recovery controls on the right. The bow tie is used to show where controls were absent or failed and what the consequence of each failure was.
Categories of Contributing Risk Factors
Most workplace incidents involve multiple contributing factors across different categories. The analysis identifies which factors were present in each matter and assesses their causal significance.
Failures in the WHS management system, including absent or inadequate policies, procedures, risk assessments or safe work method statements that permitted the hazard to exist without adequate controls.
Failures in supervision of workers, contractors or work activities, including inadequate monitoring, failure to enforce safety procedures and failure to identify and correct unsafe acts or conditions.
Absence of adequate training or competency assessment for workers performing the relevant task, including where workers were permitted to perform work without the knowledge or skills to do so safely.
Mechanical failure, inadequate guarding, poor maintenance or selection of unsuitable equipment for the task. Plant and equipment failures are assessed against the obligations of designers, manufacturers, suppliers and PCBUs.
Physical conditions at the workplace that contributed to the incident, including surface conditions, lighting, layout, weather and workplace design. Assessment includes whether these conditions were foreseeable and whether controls were available.
Broader organisational factors that created the conditions for the incident, including production pressure, normalisation of unsafe practices, inadequate safety leadership and failure to act on prior hazard reports or near misses.
System Failures vs Individual Failures
A key aspect of WHS causation analysis is the distinction between failures at the system level and failures at the individual level. In most serious workplace incidents, both types of failure are present. The analysis examines each level separately and assesses its contribution to the outcome.
System-level failures are failures in the organisational controls that should have prevented the incident regardless of the actions of individual workers. Individual-level failures are actions or omissions by specific workers or supervisors that directly contributed to the incident. Both levels are relevant to the assessment of duty holder obligations and breach.
- Absence of required policies, procedures or risk assessments
- Inadequate contractor management and coordination arrangements
- Failure to act on prior hazard reports, near misses or audits
- Production pressure that overrode safety considerations
- Management decisions that created or maintained unsafe conditions
- Absence of adequate monitoring or review of safety controls
Limitations of Causation Analysis
Causation analysis in WHS expert opinion has defined boundaries. Understanding what the analysis does and does not address helps solicitors and barristers use the expert opinion most effectively in proceedings.
A WHS expert can give opinion on the technical causal factors that contributed to a workplace incident, the connection between identified failures in safety controls and the occurrence of the incident, and the role of duty holder conduct in creating the conditions for the incident to occur.
The WHS expert does not give opinion on the ultimate question of legal liability, on the extent of the plaintiff's injury or its medical causation, or on the assessment of damages. Those questions fall within the role of the court, medical experts and other specialist witnesses.
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Is causation analysis separate from breach analysis?
They are separate types of analysis but are closely related and are often addressed in the same expert report. The breach analysis assesses whether the duty holder failed to meet their WHS obligations. The causation analysis assesses whether that failure caused or contributed to the incident and injury. Both are needed to support a finding of liability in most WHS proceedings.
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Can causation be addressed where the incident circumstances are disputed?
Yes. Where the incident circumstances are disputed, the causation analysis is prepared on stated assumptions about the facts. Different assumptions can produce different causation conclusions, and the report can address the causation question on alternative factual assumptions if instructed to do so. This allows the court to understand the causation position under different factual findings.
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What if there are multiple defendants each arguing another caused the incident?
The causation analysis can address the contribution of each defendant separately. Where multiple duty holders each bear some responsibility for the incident, the analysis identifies the role of each and the connection between each party's conduct and the outcome. This assists the court in apportioning responsibility where that is in issue.
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Can the analysis address a worker's contribution to the incident?
Yes. Where the conduct of the injured worker contributed to the incident, the analysis can address that contribution. This is relevant to contributory negligence in civil proceedings. The analysis assesses the worker's conduct in the context of the training, instruction and supervision they received from the PCBU, and whether any failure by the worker was itself a consequence of a system failure by the employer.
Request a Causation Analysis
Contact Karim Ali to discuss the causation issues in your matter and the scope of expert opinion required.