Biosystems One / Calculation verification example
ErgoThrive RULA engine fixture note
Document version: 1.0 Date: August 7, 2026
Scope: This report documents a deterministic software fixture. It does not represent a real worker, workplace, clinical conclusion, regulatory determination, or completed qualified-ergonomist validation.
Engine under test
| Method | Rapid Upper Limb Assessment (RULA) |
|---|---|
| Engine identifier | RULA-1993/1.2 |
| Fixture purpose | Verify stable mapping from validated inputs to an interpretable result |
Illustrative input
| Upper arm | Lower arm | Wrist | Neck | Trunk |
|---|---|---|---|---|
| 32° | 78° | 8° | 16° | 12° |
Configured modifiers are neutral, wrist twist and legs are set to band 1, the assessed side is right, and fixture confidence is 0.92.
Expected result
The deterministic test expects a final RULA score of 3 and at least one generated recommendation. Boundary tests separately verify posture thresholds, valid table combinations, malformed-input rejection, and score capping under extreme configured modifiers.
Validation boundary
Passing software fixtures supports calculation consistency; it does not prove that source observations are representative or that recommendations fit a workplace. Scoring fixtures and recommendation wording remain subject to review by qualified ergonomists before commercial launch.