Definition
Root cause analysis (RCA) is a structured method for finding the underlying cause of a problem — not just the visible symptom — so that a fix will actually prevent the problem from happening again.
RCA is a disciplined problem-solving approach used across manufacturing, healthcare, IT, aviation, and quality. Instead of stopping at the first plausible explanation, an RCA keeps asking why and gathering evidence until the team reaches a cause that, if removed, would prevent recurrence.
Why RCA matters
Prevents recurrence. A verified root cause leads to a lasting fix, not a repeat call-out next week.
Focuses spending. Time and money go into the change that actually removes the problem.
Builds learning. Every case becomes a shared reference for the team.
Improves safety and quality. Fewer surprises on the line, in the product, or in the service.
The EasyFixProblem workflow
EasyFixProblem uses one unified RCA workflow. The case status (Open / In Progress / Closed) tracks the overall investigation, while these four stages guide the actual problem-solving work.
Define
State the problem in facts: what is happening, where, since when and how often. Describe the actual deviation, not the suspected cause.
Analyse
Map possible causes with Fishbone, then drill the strongest candidates with 5-Why. Branch where the evidence branches.
Act
Contain the problem first, then implement corrective and preventive actions with owners and due dates.
Verify
Check the metric again after the fix. Lock in the improvement through SOP updates, lessons learned and horizontal replication.
Core analysis tools
Fishbone and 5-Why are built into every case. They are not competing methodologies — they are two lenses on the same investigation.
Fishbone (Ishikawa)
Spread possible causes across machine, method, material, people, measurement and environment.
Use it Best when the problem has several plausible causes and you need a structured brainstorm before drilling down.
5-Why
Take the strongest fishbone candidates and keep asking why until you reach something you can actually change.
Use it Best when you need to turn a suspected cause into a validated root cause with evidence and confidence.
Start with the actual phenomenon. Write what you can see and measure, not what you think is wrong.
Use Fishbone to open up the problem and avoid jumping to a single cause. Then use 5-Why on the most likely branches to reach a root cause you can validate with evidence. You can sketch the Fishbone first with the free Fishbone diagram generator — no account needed.
Mark a cause as a root cause only when removing it would prevent recurrence. Then build corrective and preventive actions, verify effectiveness, and standardise the fix.
Run your RCA in EasyFixProblem
EasyFixProblem is a purpose-built workbench for one unified RCA workflow: ten stages from problem definition to closure, with Fishbone and Why-Why as the core analysis on every case, plus a shared action-routing engine and executive PDF exports. Open a case and the app guides your team through each stage until the actions are closed and verified.