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Root Cause Analysis

Technology Fundamentals

Root Cause Analysis

1 min readPublished 22 Jul 2026

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Fixing the symptom gets you through today; fixing the root cause stops the problem coming back. Root cause analysis (RCA) is what turns a technician into a problem solver.

Interactive explainer

Root Cause Analysis

Fix the cause, not just the symptom.

11. Define the problem22. Gather evidence33. 5 Whys / fishbone44. Fix & prevent

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1. Define the problem

Symptom vs cause.

State the problem precisely and distinguish the visible symptom from the underlying cause you're trying to find. Vague problems can't be solved.

Check your understanding

1. What is the 5 Whys technique?

2. Why do RCA?

Keep learning

Root Cause AnalysisITIL & Change Management ITIL 4 Foundation
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The techniques

  • 5 Whys — ask "why?" repeatedly until you reach the true cause (not just the surface issue).
  • Fishbone (Ishikawa) diagram — map possible causes across categories (people, process, technology, environment).
  • Evidence-based — use logs, monitoring and data, not assumptions.
  • Preventive action — implement a fix that stops recurrence, then document it.

RCA is the heart of ITIL problem management (ITIL & change) and connects to incident handling in Cyber Security Fundamentals. Employers love candidates who prevent problems, not just react to them.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

RCA shows analytical maturity — employers value people who prevent problems, not just react.

Technical questions
How would you perform a root cause analysis?+

Gather evidence, apply 5 Whys/fishbone to find the true cause, implement a preventive fix, and document it.

Behavioural questions
Tell me about fixing a recurring problem for good.+

Show finding the underlying cause with evidence and preventing recurrence.

Real-world scenarios
“The same server crashes every Monday morning.”+

Expected answer: Do RCA — correlate logs/monitoring, apply 5 Whys (e.g. a scheduled job), fix the cause and verify it stops.

Practise in AI Interview™Rehearse these questions, scored.Plan with Career Coach™A personalised path to your goal.Evidence it in Career Passport™Prove this skill to employers.

Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles
Problem ManagerSystems AdministratorSOC Analyst
Skills you're proving
Root cause analysis5 WhysPrevention
Recommended certifications
CompTIA A+ITIL 4 Foundation
Career progression

IT Career Skills → operations/engineering/security roles.

What employers expect

That you can work professionally: communicate clearly, follow process, document, and put the user first.

Frequently asked questions

What is the difference between a symptom and a root cause?

A symptom is the visible effect; the root cause is the underlying reason it happens — fix the cause to prevent recurrence.

What is the 5 Whys technique?

Repeatedly asking 'why?' (about five times) to drill past symptoms to the true underlying cause.

Why do root cause analysis?

To stop recurring incidents for good, rather than repeatedly firefighting the same symptom.

Related guides

IT Career Skills: Documentation, Troubleshooting, ITIL & CommunicationDocumentation SkillsTroubleshooting MethodologyTicketing & Service Desk

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