Toolbox Talk

Incident Investigation Process and Techniques

TBT-INC-018

Investigating incidents and near misses is essential for understanding what went wrong and preventing recurrence. A thorough investigation identifies root causes, not just immediate triggers, and leads to meaningful corrective actions. This talk explains the investigation process, the techniques used to gather evidence, and the role every operative plays in supporting investigations on site.

Key Hazards
Repeat incidents caused by failure to investigate and address root causes
Evidence lost or contaminated because the scene was not properly preserved
Blame culture discouraging honest reporting of incidents and near misses
Corrective actions that address symptoms rather than the underlying root cause
Control Measures
  • Secure the incident scene immediately to preserve physical evidence and prevent further harm.
  • Report all incidents and near misses through the site reporting system without delay.
  • Record witness statements as soon as possible while memories are fresh and accurate.
  • Take photographs and measurements of the scene, equipment, and conditions before anything is moved.
  • Use structured root cause analysis techniques such as the 5 Whys or fault tree analysis.
  • Focus on system failures and process gaps rather than blaming individual workers.
  • Identify corrective and preventive actions with named owners and realistic completion dates.
  • Share investigation findings and lessons learned with the wider workforce through briefings.
  • Review corrective actions after implementation to verify they are effective and sustained.
Remember
  • Secure the incident scene immediately to preserve evidence and prevent further harm to anyone
  • Report all incidents and near misses without delay through the site reporting system
  • Record witness statements as soon as possible while memories are still fresh and accurate
  • Use structured techniques such as the 5 Whys or fault tree analysis to find root causes
  • Focus on system failures and process gaps rather than blaming individual people
  • Share investigation findings and lessons learned with the wider workforce through briefings
Applicable Legislation: CDM Regulations 2015 · RIDDOR 2013 · Health and Safety at Work etc. Act 1974 · Management of Health and Safety at Work Regulations 1999
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