Incident Investigation Report
An Incident Investigation Report is a formal document that records the facts, causes and corrective actions of a workplace event. Under the WHS Act 2011, PCBUs must investigate incidents to prevent recurrence and ensure compliance with safety duties.
A formal record used to document the details of a workplace accident, near miss or hazardous event to determine the cause and prevent future occurrences.
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About this Document
An Incident Investigation Report is a vital document for every Australian business and tradesperson. It serves as the official record of what happened during a workplace event. This event could be an injury to a worker, damage to property, a near miss where someone could have been hurt, or an instance of ill health like chemical exposure. Under the Work Health and Safety Act 2011 (WHS Act), which applies in most states and territories, persons conducting a business or undertaking (PCBUs) have a primary duty of care to ensure the health and safety of workers. This duty includes maintaining a safe workplace and providing safe systems of work. When something goes wrong, this report is the tool you use to find out why. The purpose of this report is not just to record facts for management or insurance companies. Its main goal is prevention. By investigating the incident properly, you can identify the root cause. You can then put controls in place to stop it from happening again. The report creates a paper trail that shows regulators, such as Safe Work Australia or state specific bodies like WorkSafe Victoria and SafeWork NSW, that you take your safety obligations seriously.
You need this document whenever a notifiable incident occurs or when a specific internal policy triggers an investigation. The WHS Act requires you to notify your regulator immediately if a serious incident occurs. This includes the death of a person, a serious injury or illness, or a dangerous incident that exposes a worker or a member of the public to a serious risk. Even if the incident is not serious enough to notify the regulator, you should still investigate and document it. A minor injury today could lead to a major one tomorrow if the cause is not fixed. For example, if a tradesperson trips over a loose cable and sprains an ankle, that is a recordable injury. If you do not investigate and fix the cable, someone else could trip and hit their head next week. The report helps you track these patterns.
Completing the report involves a structured process. You must start by securing the site to ensure no further harm occurs and evidence is not lost. You then gather information. This includes taking photos, inspecting equipment, and reviewing CCTV footage if available. The most critical part is talking to witnesses. You should interview everyone involved as soon as possible while their memory is fresh. Ask open questions to find out what they saw, what they were doing and how they were feeling. Do not lay blame. The investigation focuses on facts, not fault. The report itself must be objective. Write down exactly what happened, the time, the date, the location and the people involved. Describe the sequence of events leading up to the incident and the immediate aftermath.
Legal requirements for this document are strict. The model WHS Regulations require that you keep records of notifiable incidents for at least five years. In some cases, insurance companies or the Australian Taxation Office (ATO) may require records related to workers compensation claims for longer periods. If you have employees covered by the Fair Work Act 2009, you must also ensure that any investigation does not unfairly discriminate or breach workplace relations laws during the process. While the AS/NZS 4801 standard for occupational health and safety management systems has been replaced by ISO 45001, the principles remain similar. You must document the incident, the investigation findings and the corrective actions taken.
A common mistake is confusing the incident report with the investigation report. An incident report is usually filled out immediately by the person involved or a supervisor. It captures the initial facts. The investigation report is a more detailed document completed after a thorough review. It looks deeper into why the incident happened. Another common mistake is focusing solely on human error. Saying the worker was careless is rarely a sufficient root cause. You must look at underlying factors. Was the worker trained properly? Was the equipment faulty? Was the lighting poor? Did a production deadline force them to rush? These are the factors the report must uncover. If you blame the worker without looking at the system, the regulator may view this as a failure of your duty of care.
Another error is waiting too long to start the investigation. Memories fade quickly. Evidence can be cleaned up or removed. You should start the process as soon as the emergency is over. Also, failing to involve the workers in the investigation is a missed opportunity. They often know the risks better than anyone else. Under the WHS Act, you must consult with workers on matters affecting their health and safety. This includes investigating incidents.
Confidentiality is also important. The report may contain personal information about injured workers, including medical details. You must handle this information in accordance with the Privacy Act 1988. Access should be restricted to people who need it for the investigation or for corrective action. You must also be careful about admitting liability in the report if there is a potential for legal action. Stick to the facts. Avoid speculative language about who is legally at fault. Leave that for the legal experts and insurers.
The structure of a good report includes several key sections. You need the administrative details like the date and time of the incident, the location and the weather conditions. You need a list of people involved, including witnesses and the investigator. You need a description of the injury or damage. The core of the report is the description of the event. This should be a chronological timeline. You should then analyse the immediate causes and the underlying or root causes. The report must recommend corrective actions. These actions should follow the hierarchy of controls. This means you should try to eliminate the risk first. If you cannot eliminate it, substitute it with something safer, isolate it, use engineering controls, or use administrative controls. Personal Protective Equipment (PPE) is the last resort.
Finally, the report must track the implementation of these recommendations. Who is responsible for fixing the problem? When will it be done by? How will you check that it worked? Without this follow up, the investigation is a waste of time. The Incident Investigation Report is a living document. It should be reviewed during your regular safety audits. If the same type of incident happens again, you look at the previous report to see what was missed. This continuous improvement cycle is the heart of Australian WHS law. It helps you meet your obligations, protect your workers and keep your business running.
Key Facts
- PCBUs must notify the regulator immediately of notifiable incidents under section 38 of the WHS Act.— WHS Act 2011 (Cth)
- Records of notifiable incidents must be kept for at least 5 years.— WHS Regulation 2011 (Cth)
- The investigation must identify the root cause rather than attributing blame to individuals.— Safe Work Australia
- Consultation with workers on health and safety matters is a legal requirement during investigations.— WHS Act 2011 (Cth)
- Personal information in reports is protected under the Privacy Act 1988.— Privacy Act 1988 (Cth)
Sources
Required Sections
Incident Details
Administrative data such as date, time, location and weather.
Incident Details
Date and Time of Incident
Date: Time:
Location Details
Address: Specific Site Area:
People Involved
Injured Person(s): Witnesses:
Description of Incident
What happened:
About this Section
You need to get the basic facts right first. This section records the exact time, place, and people involved. It forms the foundation of your investigation. If you get the details wrong here, the rest of the report loses value. In Australia, precise records are essential for legal protection.
Enter the date and time the incident occurred. Do not use the time you found out about it. Be specific. If the incident happened at 2:15 PM, write that down. Small differences in time matter. For the location, write the full address. If the work happened on a construction site or a large property, be specific. Write down if it was in the loading dock, on the roof, or in the warehouse aisle.
List everyone involved. This includes the injured worker, anyone who was directly part of the event, and any witnesses. Witnesses are . They provide an independent view of what happened. Without their names, you cannot interview them later.
The description field asks what happened. Write this in plain English. Stick to the facts. Describe the actions leading up to the event and the event itself. Do not guess why it happened in this box. Just state what you see.
Under the Work Health and Safety Act 2011 (Cth) and state-based mirror laws, you have a duty to preserve the incident site. Information in this section helps you do that. You must not disturb the site until an inspector arrives if the incident is notifiable. A notifiable incident includes a death, a serious injury or illness, or a dangerous incident. This is outlined in the Work Health and Safety Regulations.
Accurate details help you meet your reporting obligations to Safe Work Australia or your state regulator, such as SafeWork NSW or WorkSafe Victoria. If WorkSafe asks for your records, they will look at this section first. If there is a dispute or a compensation claim through SIRA (State Insurance Regulatory Authority) or WorkCover, this information serves as your primary evidence.
Keep it brief and accurate. Avoid emotional language. Do not use words like "negligent" or "careless" in the description. Just write the facts. For example, write "The worker fell from the ladder" rather than "The worker clumsily fell." This keeps the report professional and legally sound.
Personnel Information
Details of the injured persons, witnesses and investigators.
Personnel Information
You must record the details of everyone involved in the incident. This includes the injured worker, witnesses, and the supervisor. Accurate records help you manage the recovery process and meet your legal obligations under the Work Health and Safety Act 2011 (Cth) or relevant state legislation. The information below is essential for notifying Safe Work Australia and your workers compensation insurer.
Personnel Details
Name: [Full Legal Name] Employer: [Business Name] Job Title/Role: [e.g. Leading Hand, Electrician, Apprentice] Employment Status: [Full-time / Part-time / Casual / Labour Hire Contractor] Date of Birth: [DD/MM/YYYY] Worker ID (if applicable): [ID Number]
Contact Information
Phone Number: [Mobile or Landline] Email Address: [Email Address] Residential Address: [Suburb, State, Postcode] Emergency Contact Name: [Full Name] Emergency Contact Phone: [Phone Number]
Injury Details
This section is critical. You must describe exactly what happened to the person. Be specific about the type of injury and the part of the body affected. This information supports the claim process and helps you identify if the injury is notifiable under the Work Health and Safety Regulations 2011.
Nature of Injury: [e.g. Laceration, Fracture, Burn, Sprain/Strain, Psychological Injury] Body Part Injured: [e.g. Right hand, Lower back, Eyes, Respiratory system] Mechanism of Injury: [Brief description of how the injury occurred, e.g. Cut by angle grinder, Fell from ladder, Inhaled fumes]
Treatment and Medical Practitioner
List all medical treatment provided so far. First aid administered at the workplace counts as treatment. You must record the details of any doctor or hospital involved. If the injury results in a serious illness or death, you must immediately notify your regulator.
First Aid Provided: [e.g. Wound cleaned and dressed, Ice applied, CPR performed] Name of Treating Doctor/Medical Centre: [Practice Name] Doctor’s Phone Number: [Phone Number] Hospital Admitted: [Yes / No] Date of Admission: [DD/MM/YYYY]
Description of Event
A chronological narrative of what happened before, during and after the incident.
Description of Event
Provide a clear and chronological account of what happened. Start from the moment the work task began and finish immediately after the incident. Record the specific actions taken by the workers involved and the conditions of the site at the time.
Write your description as a list of steps. Do not include your personal opinion, speculation, or thoughts on why the incident occurred. This section must contain only objective facts that can be proven by evidence. Focus on what you saw, heard, or measured.
You must address the following points in your description:
- Date and Time: State exactly when the work started and when the incident took place.
- People Involved: List the full names and job titles of everyone present. Describe the specific task each person was performing when the incident happened.
- Location: Describe the exact site area. Mention specific hazards or environmental conditions present, such as rain, wind, uneven ground, or confined spaces.
- The Sequence: Detail the tools, plant, and equipment in use. Describe what the machine or worker was doing immediately before the incident. State exactly what went wrong.
- The Immediate Aftermath: Describe the immediate result of the incident. Mention any injuries sustained, damage to property, or spills that occurred. List the steps taken straight after the incident to render first aid or make the site safe.
Ensure your account is consistent with your obligations under the Work Health and Safety Act 2011 (Cth) and relevant state or territory WHS Regulations. Section 38 of the Model WHS Regulations requires that persons conducting a business or undertaking (PCBUs) preserve the incident site. Your description should reflect the scene as it was found, before any major changes were made.
If the incident involved dangerous machinery or hazardous chemicals, reference the specific Australian Standards (AS) or codes of practice relevant to that equipment. For example, if a ladder was involved, note the type of ladder and its condition at the time.
Keep sentences short and direct. Use the past tense. Avoid emotional language. Instead of writing "The worker was careless because they rushed," write "The worker was moving at a fast pace and did not follow the isolation procedure."
This factual record serves as the primary evidence for any internal review or investigation by Safe Work Australia regulators. Accuracy is essential. If you are unsure about a detail, state that the detail is unknown rather than guessing.
Root Cause Analysis
Investigation into why the incident happened, including underlying factors.
Root Cause Analysis
Finding who or what caused an incident is not enough. You must find out why it happened. This section uses the '5 Whys' method to dig past the obvious mistake and uncover the real cause. This helps you satisfy the Work Health and Safety Act 2011 (WHS Act), specifically your Primary Duty of Care to provide, so far as is reasonably practicable, a safe working environment.
To complete this section, ask 'Why' five times in a row for each factor involved in the incident. You must look at three key areas: the work environment, systems of work, and the people involved.
Step 1: Identify the Immediate Cause
Start with what went wrong immediately before the incident. For example, a worker fell from a ladder.
Step 2: Apply the 5 Whys
Ask why the immediate cause happened.
Example:
- Why did the worker fall? The worker slipped on a rung.
- Why did they slip? The rung was covered in oil.
- Why was there oil on the rung? The ladder was stored near a machine that leaks oil.
- Why was it stored there? There is no designated storage area for equipment in the workshop.
- Why is there no storage area? The workshop layout was not reviewed when the new machinery was installed.
In this example, the root cause is not the worker slipping. The root cause is a failure in workplace layout and risk management during the installation of new machinery.
Step 3: Check Your Systems
Review your Safe Work Method Statements (SWMS) and standard operating procedures. Did they cover this specific task? If your documents were not followed, ask why. Was the worker trained? Was the supervision adequate?
Under the WHS Regulations, you must manage risks. If you only blame the worker for slipping, the oil remains, and someone else will get hurt later. Identifying the root cause prevents the incident from happening again.
Step 4: Apply the Hierarchy of Controls
Once you find the root cause, select a control measure using the Hierarchy of Controls. Do not just rely on Administrative Controls (like telling workers to be careful) or Personal Protective Equipment (PPE).
Start from the top and work down:
- Elimination: Can you remove the hazard entirely?
- Substitution: Can you replace the hazard with something safer?
- Engineering: Can you isolate people from the hazard?
- Administrative: Can you change the way people work?
- PPE: Can you protect the worker with gear?
Using the example above, 'Eliminating' the oil leak or 'Engineering' a proper storage rack are far more effective than simply asking workers to wipe ladders before use.
Record your findings in the table below clearly. This evidence demonstrates compliance to Safe Work Australia inspectors and assists with insurance claims.
Corrective Actions
A plan to prevent recurrence of the incident.
Corrective Actions Register
Use the table below to list every step required to fix the root causes identified in this investigation. Corrective actions must be practical, specific and assigned to a competent person. This process ensures you meet your primary duty of care under the Work Health and Safety Act 2011 (WHS Act) to provide, so far as is reasonably practicable, a safe working environment.
Consult with your workers and Health and Safety Representatives (HSRs) before finalising these actions. This consultation is a legal requirement under the WHS Act and helps ensure the changes will actually work on the tools. Once you complete an action, update this document and sign off to verify the control is in place.
| Action Required | Responsible Person | Target Date | Status | Evidence / Notes |
|---|---|---|---|---|
| Replace damaged electrical cord on the concrete saw and tag accordingly | Supervisor / Site Manager | 21/10/2023 | Complete | New tag fitted, old cord disposed of |
| Purchase and install appropriate guard for the bench grinder | Business Owner | 25/10/2023 | Pending | Supplier quote attached |
| Update Standard Operating Procedure (SOP) for working at heights under 2 metres | Safety Officer | 30/10/2023 | In Progress | Draft reviewed by team |
How to fill out this section
Action Required Describe exactly what needs to happen. Avoid vague statements like "be more careful." Use active verbs like "Purchase," "Install," "Repair," or "Train." Refer to specific hazards identified in the investigation. For example, if a guard was missing, the action is to fit the guard. If a worker lacked training, the action is to book a specific course. Ensure your proposed actions align with the Hierarchy of Controls found in the Model Code of Practice: How to Manage Work Health and Safety Risks. You must aim to eliminate the risk first, then minimise it through substitution, isolation, or engineering controls before relying on administrative controls or Personal Protective Equipment (PPE).
Responsible Person Write down the full name of the individual accountable for getting the job done. For small businesses, this might be the owner or a leading hand. This ensures there is no confusion about who is handling the task. If the action requires a licensed professional, such as an electrician or an engineer, note that requirement here to ensure compliance with relevant Australian Standards (e.g., AS/NZS 3000 for electrical work).
Target Date Set a realistic deadline for completion. Urgent risks must be fixed immediately. Less critical risks should still have a set timeframe. Prompt action demonstrates you are taking reasonable steps to manage risks, which is a key factor in proving compliance with the WHS Act.
Status Track the progress of the action. Use categories such as "Not Started," "In Progress," or "Complete." Keep this table updated. If you fail to implement these corrective actions within a reasonable time, you leave the business open to repeat incidents and potential enforcement action by Safe Work or WorkSafe regulators.
Evidence / Notes Record details that prove the action is finished. This could be a receipt for new equipment, a copy of a training attendance sheet, a photo of the installed guard, or a reference number for a maintenance job. This evidence is vital if an inspector asks to see your records.
Sign-off
Authorization of the report findings.
Sign-off
Signing this document confirms that the investigation into the incident has been completed with reasonable care and that the information recorded in this report is true and correct to the best of the signatory's knowledge.
In Australia, the primary duty of care under the Work Health and Safety Act 2011 (WHS Act) requires a Person Conducting a Business or Undertaking (PCBU) to ensure, so far as is reasonably practicable, the health and safety of workers while they are at work. This duty extends to maintaining a safe workplace and ensuring that incidents are properly investigated to prevent recurrence.
By signing below, the investigator attests that the findings and recommendations detailed in this report are based on a thorough examination of the facts. This includes gathering witness statements, reviewing site conditions, and considering any relevant evidence such as CCTV footage or equipment logs. The investigator also confirms that the root cause analysis has identified any systemic failures or procedural breaches that contributed to the incident.
The manager or business owner signing this report accepts the findings and acknowledges the responsibility to implement the control measures listed in the recommendations. Under the WHS Act, ignoring identified risks or failing to act on recommendations can be considered a breach of duty. This sign-off serves as a record that management has been informed of the hazards and has agreed to allocate the necessary resources to fix them.
This report forms part of your safety management system and may be requested by the Safe Work Australia regulator or your state or territory Work Health and Safety authority during an inspection or following a notifiable incident. Accurate records are essential for demonstrating compliance with the Model Code of Practice: How to Manage Work Health and Safety Risks.
Please ensure all sections of the report are completed before signing. Do not sign if you believe the information is inaccurate or incomplete.
Investigator Declaration
I declare that the incident investigation was conducted in accordance with company policy and workplace safety standards. I confirm that the details provided are accurate.
Name: _________________________________
Position: ________________________________
Signature: _______________________________
Date: ____ / ____ / 20____
Manager / PCBU Acknowledgement
I acknowledge receipt of this investigation report. I accept the findings and confirm that the recommendations will be implemented within the specified timeframes to manage the risk and comply with WHS regulations.
Name: _________________________________
Position: ________________________________
Signature: _______________________________
Date: ____ / ____ / 20____
Frequently Asked Questions
What is an Incident Investigation Report?
When do I need an Incident Investigation Report?
Is an Incident Investigation Report legally required in Australia?
How soon should I complete the report?
Who should complete the Incident Investigation Report?
What is the difference between an incident report and an investigation report?
Can I write in the report who was at fault?
Do I need to give a copy of the report to the injured worker?
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