R&R is the acronym for Repeatability and Reproducibility, two fundamental components of the study of measurement system capability. This type of study, also known as Gage R&R, evaluates whether a measurement system (manual or automated) is accurate, reliable, and consistent, regardless of who performs it or when the measurement is made.
If your test system measures differently each time, it doesn’t measure — it guesses.
🧩 Difference between Repeatability and Reproducibility
| Term | Definition |
|---|---|
| Repeatability | Variation when the same operator measures the same part multiple times |
| Reproducibility | Variation between different operators measuring the same part |
⚙️ Why conduct an R&R study?
- Validate if the test bench is reliable for decision making
- Reduce false positives and negatives in the inspection process
- Meet quality standards such as IATF 16949 and ISO 9001
- Quantify the influence of the operator or measurement on the results
- Increase confidence in metrics like CPK, PPK, FPY, etc.
🔧 How AJOLLY Testing supports R&R studies in test benches
AJOLLY Testing designs test benches focused on metrological repeatability, mechanical robustness, and precise automation, in addition to providing full support for execution and analysis of R&R studies.
🛠️ Benches prepared for R&R
- Rigid mechanical architecture to avoid positioning variations
- Calibratable sensors, with low drift and suitable measurement range
- User-friendly interfaces for automated or manual repetition of cycles
📊 Software supporting R&R study
- Data export to Excel, Minitab, Power BI or our internal application TestReportStats, which performs extraction directly from the test reports of our test benches.
- Automated test sequences with controlled variation of operators and parts
- Structured logs for statistical analysis with separation by operator, part, and cycle
📁 Technical documentation
- R&R procedures (POP / SOP) for internal use or audit
- Reports with variation graphs, percentage contribution, and reliability analysis
- Support for integrating results with FMEA, MSA, and IATF 16949
With AJOLLY Testing, your test system not only measures — it measures correctly, always, and with technical traceability.