Conducting an HSE investigation
HSE investigations identify the immediate causes of an incident or near miss (what happened) and the underlying causes (why it happened). Addressing only the immediate causes risks repeat accidents; resolving underlying causes helps prevent recurrence and strengthens the management system.
8D is an ideal process for HSE investigations
The Eight Disciplines (8D) method is a robust investigation and problem-solving framework used across many industries. It fits HSE work well by guiding teams to contain hazards, analyze root causes, implement corrective actions and prevent recurrence:
- Containment of the problem
- Root cause analysis
- Problem correction (corrective actions)
- Problem prevention (system changes)
HSE investigation workflow
Discipline 0 (D0): Summary
Name the HSE investigation clearly to support communication (e.g., incident descriptor and date). Write a short factual summary that will title the investigation report.
Discipline 1 (D1): Investigating team
Define the cross-functional team (process owner, HSE, supervisors, SMEs). Record names, roles and relevant competencies.
Discipline 2 (D2): Description of incident
Describe workplace conditions, machines, tools, materials and methods that caused or contributed to the incident. Examples:
- The guard had been removed from the machine, allowing the operator's hand to contact the rotating part.
- The floor was cracked, causing the operator to trip.
- Current practice requires reaching into the tumbler, creating a splash hazard.
- Water dripping from the ceiling made the walkway slippery.
Discipline 3 (D3): Immediate remedial actions
First, remove immediate risk to prevent repeat occurrences. List actions and status:
- Isolated and quarantined the machine
- Erected warning signage and briefed staff
- Issued safety glasses to the operator
- Installed temporary barriers around the area
Discipline 4 (D4): Actual/probable root causes
Ask why the immediate causes occurred and identify underlying systemic causes. For example, if a handrail failed due to loose fixings, why were fixings loose? Keep asking "why" until systemic issues are exposed.
- The guard was removed to increase throughput to meet targets.
- The specified floor material was unsuitable for the environment.
- Mandatory use of safety glasses was omitted from training.
- Roof damage from walkway debris led to water ingress.
Discipline 5 (D5): Permanent corrective actions
Identify and justify solutions that address root causes. Use brainstorming techniques if helpful, then select actions that remove or control the underlying risk rather than only treating the visible symptom.
- Route the job to the correct guarded machine (e.g., X263455).
- Replace the floor with a suitably durable surface.
- Add safety-glasses requirements to training and SOPs.
- Add roof/walkway protection to prevent debris.
Discipline 6 (D6): Solution deployment
Create an implementation plan with owners and due dates. Capture evidence (photos, sign-offs, measurements) that actions are effective.
Discipline 7 (D7): Procedure & system changes
Define the tasks necessary to prevent recurrence. Consider:
- Updating the management system (QHSE manual, risk assessments)
- Updating company standards and procedures
- Updating the audit plan and checks
Apply improvements to similar areas/processes where relevant.
Discipline 8 (D8): Summarise and close
Close the investigation, share lessons learned, and recognize the team. Communicating success builds support for future HSE improvements.