KPIs, strategy & continuous improvement
FMEA explained: failure mode and effects analysis with an example
How to run an FMEA: identifying failure modes, rating severity, occurrence and detection, calculating RPN, prioritizing actions, with a worked example.
Failure mode and effects analysis (FMEA) is a structured way to anticipate what could go wrong in a process or product, how serious it would be, and what to do about it before it happens. Where CAPA reacts to problems that occurred, FMEA prevents them. It is widely used in manufacturing, healthcare, food safety and any process where failures are costly.
Key terms
| Term | Meaning |
|---|---|
| Failure mode | How a step could fail (for example, wrong label applied) |
| Effect | What happens if it fails (customer receives wrong product) |
| Cause | Why the failure could happen (similar labels stored together) |
| Severity (S) | How serious the effect is, rated 1 (minor) to 10 (hazardous) |
| Occurrence (O) | How likely the cause is, rated 1 (rare) to 10 (frequent) |
| Detection (D) | How likely current controls catch it before it reaches the customer, rated 1 (certain) to 10 (unlikely) |
| RPN | Risk priority number = S × O × D |
The FMEA process
- Define scope: which process or product, and its boundaries.
- Build the team: people who know the process, quality and engineering.
- Map the process steps.
- List failure modes for each step.
- Identify effects and causes for each failure mode.
- List current controls for prevention and detection.
- Rate S, O and D using agreed scales.
- Prioritize failure modes by severity first, then RPN or action priority.
- Define actions to reduce occurrence or improve detection, with owners and dates.
- Re-rate after actions are implemented.
Worked example: product labeling
| Step | Failure mode | Effect | Cause | Current control | S | O | D | RPN |
|---|---|---|---|---|---|---|---|---|
| Apply label | Wrong label applied | Wrong product information reaches customer; possible recall | Similar labels stored together | Visual check by operator | 8 | 4 | 5 | 160 |
| Print batch code | Batch code missing | Cannot trace product | Printer ribbon runs out | Hourly check | 6 | 3 | 4 | 72 |
| Seal package | Weak seal | Product spoils | Heater temperature drift | Start-of-shift test | 7 | 3 | 6 | 126 |
Actions for the highest risk: separate label storage by product, add barcode verification at the labeling station. After implementation: S stays 8, O falls to 2, D falls to 2. New RPN = 32.
Prioritizing well
- Severity first: a high-severity failure deserves attention even with a modest RPN.
- RPN limitations: different combinations can produce the same RPN. Some industry handbooks now use an action priority approach that weighs severity, occurrence and detection in combination rather than multiplying them. Use the approach your customers or standards require.
- Prefer prevention: reducing occurrence is usually better than relying on detection.
Where FMEA is useful
- New production lines or product launches
- Changes in materials, suppliers or equipment
- Processes with safety or regulatory risk
- High-cost failures, such as payroll errors affecting thousands of employees
- After a serious incident, to look for similar risks elsewhere
Keeping FMEAs alive
An FMEA filed away after launch loses value. Update it when processes change, when failures occur that were not anticipated, and when actions are completed. Link high-risk items to CAPA and to quality control plans.
Where Cirquolus fits
The Cirquolus improvement portfolio includes FMEA workspaces along with DMAIC, DMADV, PDCA, CAPA, Kaizen, Lean and project management, connected to Business Compass KPI.
Frequently asked questions
What is FMEA?
A structured method for identifying potential failures in a process or product, assessing their risk and planning actions to prevent them.
How is RPN calculated?
Risk priority number = severity × occurrence × detection, each rated on a scale, commonly 1 to 10.
What is the difference between FMEA and CAPA?
FMEA anticipates potential failures before they happen. CAPA addresses problems that have occurred or been identified.
Who should participate in an FMEA?
People who know the process well, including operators, engineers and quality staff, guided by a facilitator.
Bring this workflow to a Cirquolus demo.
Show us your current process, companies and branches. We will map it to the modules you need and propose a realistic rollout.