Root Cause Analysis

What is root cause analysis?

Root cause analysis (RCA) is a structured process used to identify the underlying reason an incident, failure, or workplace problem occurred. Its purpose is to address the source of the issue and prevent it from happening again.

Why is root cause analysis important?

Without root cause analysis, an organization may only correct the immediate problem. This can allow the same incident or failure to occur again.

Effective root cause analysis can help organizations:
  • Prevent repeat incidents
  • Improve workplace safety
  • Strengthen procedures and controls
  • Reduce operational disruptions
  • Support effective corrective actions
  • Identify broader organizational issues
  • Create safer systems of work

What is the difference between a root cause and an immediate cause?

An immediate cause is the event or condition directly connected to the incident. For example, a worker may slip because there is water on the floor.

The root cause explains why that condition existed. The spill may not have been cleaned because inspections were inconsistent, responsibilities were unclear, or a leaking pipe had not been properly repaired.

How is root cause analysis performed?

A typical root cause analysis process involves:
  1. Defining the incident or problem
  2. Collecting reports, photos, records, and other evidence
  3. Speaking with the people involved
  4. Identifying contributing factors
  5. Determining the underlying cause
  6. Developing corrective actions
  7. Assigning responsibility and deadlines
  8. Reviewing whether the actions were effective
The process should focus on understanding what happened rather than assigning blame.

What methods are used for root cause analysis?

Common root cause analysis methods include the Five Whys, fishbone diagram, fault tree analysis, and change analysis. The most suitable method depends on the complexity and severity of the incident.

Simple events may only require a short review, while serious or recurring incidents may need a more detailed investigation.

How does root cause analysis software help?

Root cause analysis software helps organizations collect evidence, document findings, assign corrective actions, and track follow-up tasks. It can connect the analysis to the original incident report, investigation records, and supporting documents.

Centralized data can also help safety teams identify recurring causes and trends across different sites, departments, or incident types.

Who should conduct a root cause analysis?

The analysis may be completed by a supervisor, safety professional, investigator, manager, or a team with relevant knowledge. Serious incidents may require specialists or independent investigators.

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