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Podcast: The Occupational Safety Leadership Podcast
Episode: Episode 93 - 4 x 4 Risk Assessment Matrix
Description: Dr. Ayers explains the 4×4 Risk Assessment Matrix, a simplified version of the more common 5×5 tool. The episode focuses on how reducing the scoring options can actually improve consistency, reduce over‑precision, and make risk conversations more meaningful.
1. Structure of the 4×4 Matrix
The matrix evaluates hazards using Severity and Likelihood, each scored from 1 to 4.
Severity (1–4)
1 – Minor: First aid only
2 – Moderate: Recordable injury
3 – Serious: Lost time or significant medical treatment
4 – Severe/Catastrophic: Permanent disability or fatality
Likelihood (1–4)
1 – Rare: Unlikely to occur
2 – Possible: Could happen occasionally
3 – Likely: Happens regularl...