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Icologiq Knowledge · Method
Root Cause Analysis
A systematic approach for identifying the underlying causes of a problem or event instead of addressing only its immediate symptoms.
RCA
Also known as:
root cause investigation, cause analysis
At a glance
Type
Method
Topic
CAPA & Incidents
Applies to
Cross-industry
Current version
Status
Last reviewed
September 14, 2026
Definition
Root Cause Analysis is a structured investigation approach used to understand why an unwanted event or problem occurred. Methods vary, but the goal is to distinguish immediate causes from deeper process, organizational or control factors so that corrective actions address what drives recurrence.
Why it matters
Root cause analysis matters because correcting the visible problem alone may allow the same issue to return. A structured investigation helps identify underlying causes so corrective actions can address why the problem occurred, not only what happened.
Describe the event, nonconformance or failure precisely, including where and when it occurred and what evidence is available.
Define the problem and scope
1
Gather records, data, timelines, interviews and observations before selecting a preferred explanation.
Collect relevant facts
2
Use an appropriate method such as 5 Whys, Fishbone Diagram or causal analysis to explore conditions and interactions.
Identify contributing causes
3
Challenge whether each proposed cause is necessary, sufficient or supported and distinguish symptoms from deeper system conditions.
Test causes against evidence
4
Choose controls or changes that directly respond to supported causes and assign accountable owners.
Select actions that address causes
5
Check after implementation whether recurrence or the targeted weakness actually reduced.
Verify effectiveness
6
Method explained
A disciplined Root Cause Analysis approach
Root Cause Analysis seeks the underlying conditions that made a problem possible and that can be changed to reduce recurrence. The investigation should be proportionate, evidence-based and open to multiple contributing causes rather than forcing a single root cause.
A root cause questioning method that repeatedly asks why a problem occurred to move from visible symptoms toward underlying causes.
5 Whys
Method
· CAPA & Incidents
A visual cause-analysis method that groups possible causes of a problem into structured categories so teams can investigate them systematically.
Fishbone Diagram
Method
· CAPA & Incidents
A prioritization method that ranks problem or cause categories by frequency, cost or other impact so teams can focus investigation and improvement effort where it matters most.
Pareto Analysis
Method
· CAPA & Incidents
An observation or conclusion from an audit that identifies conformity, nonconformity or another issue requiring evaluation or follow-up.
Audit Finding
Concept
· Audit
A structured process for addressing causes of actual or potential problems through corrective or preventive measures and verifying that actions are effective.
CAPA
Process
· CAPA & Incidents
The structured process for reporting, assessing, investigating, following up and learning from incidents and related events.
Incident Management
Process
· Incident Management
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