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.
Common RCA techniques
Six methodologies cover almost every investigation. Tap a card to see when it fits best.
5-Why
Fast · Field-ready
Fishbone (Ishikawa)
Team brainstorm
PDCA
Improvement loop
DMAIC
Six Sigma
8D
Customer complaint
A3
Executive summary
How to pick a technique
Match the shape of the problem to the shape of the method.
One machine, one clear failure
5-Why or Fishbone
Cross-functional brainstorming
Fishbone
Piloting a change and measuring impact
PDCA
Chronic, data-heavy loss
DMAIC
Customer complaint or quality escape
8D
Executive summary of a completed investigation
A3
Run your RCA in EasyFixProblem
EasyFixProblem is a purpose-built workbench that gives you all six of the techniques above with structured inputs, a shared action-routing engine, and executive PDF exports. Open a case, pick one or more techniques, and the app guides your team through each step until the actions are closed and verified.