Introduction

In Occupational Health and Safety (OHS) management, the statement that “accidents do not happen, they are caused” reflects an important principle of prevention. In ordinary language, accidents are often described as sudden and unfortunate events. In professional safety practice, however, that view is inadequate because workplace accidents are usually linked to identifiable causes and contributing factors such as unsafe acts, unsafe conditions, poor supervision, inadequate training, defective equipment, weak communication, and failures in management systems. The International Labour Organization [ILO] (2015) notes that occupational accidents and other undesired events are preventable, which supports the argument that they arise from causes that can be examined and controlled.

The statement may be defended on the basis that most accidents have both immediate and underlying causes. Immediate causes include acts or conditions directly connected to the event, such as failure to wear personal protective equipment, poor machine guarding, slippery floors, or unsafe use of tools. Beneath these, however, there are often deeper organisational problems, including weak supervision, inadequate training, poor maintenance, ineffective enforcement of safety procedures, and failure to conduct proper risk assessments. The ILO (2015) explains that effective investigation should establish not only what happened, but also why it happened. This suggests that accidents are not random events. If causes can be identified after an incident, many of them could, at least in principle, have been recognised earlier and controlled.

Accident causation theories also strengthen this argument. Heinrich’s Domino Theory presents injury as the outcome of a sequence of connected events. Although that model has been criticised for giving too much attention to worker behaviour, it remains useful because it established the idea that accidents have discoverable causes and that interrupting the sequence may prevent harm. Later approaches moved beyond a narrow focus on individual fault. In contemporary OHS thinking, accidents are more often understood as failures within a broader socio-technical system. This position is consistent with ISO 45001, which provides a framework for organisations to manage risks and improve OHS performance through systematic hazard identification, risk control, and continual improvement (International Organization for Standardization [ISO], 2018).

A practical example makes this clearer. If a worker falls from height on a construction site, it may be easy to say that the worker had an accident. Yet further examination may show that guardrails were missing, the scaffold was not properly inspected, supervision was weak, and the worker had not received adequate training. Under such circumstances, the event cannot reasonably be treated as something that simply happened. It is better understood as the outcome of technical, human, and managerial failures. The Health and Safety Executive [HSE] states that investigating accidents and incidents helps organisations find out what went wrong, identify avoidable risks, and learn lessons that may reduce or prevent future accidents (HSE, 2022).

At the same time, the statement should be handled with some caution. It would be too simplistic to argue that every accident has one single cause. In many workplaces, accidents emerge from the interaction of people, machines, materials, environmental conditions, and organisational decisions. Even so, the statement remains valid because it rejects fatalism. Once accidents are viewed as caused events, attention shifts to hazard identification, risk assessment, control measures, monitoring, and corrective action. That preventive logic is also reflected in ISO 45001, which is intended to help organisations provide safe and healthy workplaces by preventing work-related injury and ill health and by proactively improving OHS performance (ISO, 2018).

Accident investigation is therefore central to OHS management for several reasons. The following are four importance reasons of accident investigation in OHS management

1. Identification of root causes

First, it helps identify root causes. A proper investigation goes beyond the surface event and asks why the unsafe act or condition existed in the first place. This helps organisations distinguish symptoms from deeper causes and makes corrective action more effective. The ILO (2015) emphasises that investigation should uncover causes in order to guide preventive action.

2. Prevention of recurrence

Second, accident investigation helps to prevent recurrence. The value of an investigation is not limited to understanding the past. It is equally concerned with protecting the future. Once an incident is properly examined, management can identify practical measures to reduce the likelihood of a similar event happening again. These may include revising procedures, improving engineering controls, retraining workers, strengthening supervision, improving housekeeping, or replacing defective equipment. HSE (2022) explains that organisations investigate accidents and incidents in order to learn lessons and take action that may reduce or prevent similar events in the future.

3. Improvement of the OHS management system

Accident investigation improves the overall OHS management system. Incidents often reveal weaknesses in training, communication, supervision, consultation, maintenance, or implementation of policy that are not obvious during routine operations. In this way, investigation supports continual improvement rather than mere fault-finding. This is in line with ISO 45001, which emphasises management-system performance, corrective action, and continual improvement (ISO, 2018).

4. Legal, administrative, and learning purposes

Accident investigation supports legal compliance, documentation, and organisational learning. It helps employers gather facts accurately, preserve records, respond to regulators or insurers, and share lessons across the organisation. In this respect, investigation is not only reactive but also educational, since it turns an adverse event into an opportunity for stronger prevention and better management practice (HSE, 2022; ILO, 2015).

 Why supervisors should lead accident investigation

Supervisors are generally expected to lead accident investigations because they are the closest line managers to the work situation. They understand the job being performed, the workers involved, the equipment used, and the conditions under which the work is done. This practical familiarity places them in a strong position to identify what changed, what failed, and which procedures were not followed. In addition, supervisors are often among the first to know that an incident has occurred. Their prompt involvement makes it easier to secure the scene, preserve evidence, identify witnesses, and collect information before conditions change. HSE (2022) stresses the importance of prompt, step-by-step inquiry so that organisations can establish what went wrong and act on the findings.

Supervisors should also lead investigations because safety is part of line management responsibility. Safety should not be left entirely to the OHS department. If supervisors are responsible for planning work, assigning duties, enforcing procedures, and monitoring performance, then they should also take responsibility when something goes wrong in their area. Their leadership in investigation reinforces accountability and supports the view that safety is part of everyday management. However, serious or technically complex incidents may still require support from OHS professionals, engineers, senior management, or regulators. Even so, at the operational level, the supervisor remains the most suitable person to lead the initial investigation because of proximity, familiarity, and direct responsibility.

In conclusion, the statement that accidents do not happen, they are caused is valid and defensible in OHS management. Workplace accidents generally arise from identifiable immediate and underlying causes rather than pure chance. This understanding encourages prevention instead of fatalism. Accident investigation is important because it identifies root causes, prevents recurrence, improves the OHS management system, and supports legal compliance and organisational learning. Supervisors should lead accident investigation because they are closest to the work, are often first on the scene, and carry direct operational responsibility for safety performance. Effective OHS practice therefore depends on recognising that accidents are not simply chance events, but outcomes whose causes must be identified and controlled.

References

Health and Safety Executive. (2022). Investigating accidents and incidents (HSG245). HSE Books.

International Labour Organization. (2015). Investigation of occupational accidents and diseases: A practical guide for labour inspectors. International Labour Office.

International Organization for Standardization. (2018). ISO 45001:2018 occupational health and safety management systems—Requirements with guidance for use.