# MSA Reference Guide

## GR&R Studies
- Method: Xbar-R or ANOVA
- Standard: 10 parts × 3 operators × 3 trials
- Acceptance:
  - %GR&R < 10%: Acceptable
  - 10-30%: Conditionally acceptable
  - >30%: Unacceptable
- ndc ≥ 5: Adequate resolution

## Bias Study
- 10-25 measurements of reference standard
- Acceptance: %Bias < 10%

## Linearity Study
- 5 parts covering full range
- 10-15 measurements per part
- Acceptance: %Linearity < 10%, R² > 0.75

## Stability Study
- Control chart monitoring over time
- Acceptance: In control, no trends