Assessment guide

Each method measures a different ergonomic exposure. Understanding the scores helps you interpret the composite task grade and decide where to act first.

REBA — Rapid Entire Body Assessment

Score 1–15

REBA evaluates whole-body posture risk. It scores trunk, neck and leg positions, whether loads are handled, and how the task is performed (static postures, repeated actions, or sudden changes).

0–1 Negligible2–3 Low4–7 Medium8–15 High/Very high

Higher scores mean more urgent ergonomic intervention. REBA is ideal for lifting, bending, and whole-body tasks.

RULA — Rapid Upper Limb Assessment

Score 1–7

RULA focuses on the upper body: neck, trunk, arms, wrists, and muscle use. It is designed for tasks like assembly, typing, or work above shoulder height where the arms and wrists are heavily loaded.

1–2 Negligible/Low3–4 Low/Medium5–6 Medium/High7 Very high

A RULA score of 7 is the maximum and indicates a very high risk upper-limb posture or force exposure.

Revised Strain Index (RSI)

Score 0+

RSI quantifies distal upper-extremity strain from repetitive hand-intensive work. It combines intensity of exertion, duration and frequency of exertion, hand/wrist posture, speed of work, and daily task duration.

<5 Safe5–9.9 Borderline10–19.9 Hazardous20+ Highly hazardous

RSI is especially useful for gripping, pinching, and fine repetitive motions.

NIOSH Composite Lifting Index (CLI)

Manual entry

The CLI is a manual entry you provide for multi-task lifting scenarios. It compares the task’s lifting demands against the NIOSH recommended exposure limit.

1.0 Recommended limit>1.0 Increasing risk3.0+ High risk

Because CLI is entered manually, it is not estimated from video or photos. It only affects the composite when you add it.

Task rotation intervals

By composite grade

The report's ideal task rotation interval is filled in automatically from the composite grade. It can always be edited.

A — No rotations recommendedB — 6 hoursC — 2–4 hoursD — 60–90 minutesF — 30 minutes

Each interval is followed by “if allowable.”

How the composite grade is calculated

Each assessment is normalized to a 0–100 scale. The composite score is 80% of the weighted average of the included methods plus 20% of the worst (highest) normalized score. If you add a CLI, it receives extra weight because it is task-critical lifting data.

Build a composite score