What is Tripod Beta?

Tripod Beta is an incident-investigation methodology developed by Shell that traces causation through agent–hazard–target trios, identifies failed barriers, and groups latent failures into eleven General Failure Types.

Born from Shell's research into major hazard incidents in the 1990s, Tripod Beta moved investigations beyond linear root-cause thinking. It treats every incident as the convergence of an active failure, situational preconditions and underlying organisational weaknesses — making it the gold standard for high-hazard industries like oil & gas, mining and chemicals.

BY RiskoPilot Editorial Team · REVIEWED 2026-06-20

How it works

1. STEP 01

   Capture the narrative

   Collect first-hand witness statements, control-room logs, CCTV and timestamps. The narrative becomes the source of truth for every downstream artefact.

2. STEP 02

   Identify the Top Event and HET trios

   Pinpoint the loss of control. Decompose every contributing thread into agent–hazard–target trios.

3. STEP 03

   Map barriers and classify failures

   For each trio, list every preventive and recovery barrier. Mark each barrier intact, failed or missing.

4. STEP 04

   Trace immediate causes and preconditions

   For every failed barrier, identify the unsafe act or condition (immediate cause) and the situational factors that enabled it.

5. STEP 05

   Surface latent failures via GFTs

   Classify each precondition under one of the eleven General Failure Types to expose the organisational weaknesses that must change.

6. STEP 06

   Generate prioritised recommendations

   Produce specific, measurable, time-bound recommendations targeting the most critical latent failures — and track them to closure.