Bernhard Schieber

Swiss Cheese Model: Investigate the Defenses Around the Error

Communication · Executive Insight Brief · 349

Find the defenses that let the error through

The Swiss Cheese Model directs incident analysis toward layered defenses and latent conditions instead of allowing the nearest unsafe act to become the whole causal story

Premise

A serious failure rarely requires only one thing to go wrong. High-risk systems rely on multiple defenses because people, procedures, technology, and organizations are fallible. James Reason’s Swiss Cheese Model represents those defenses as imperfect layers whose weaknesses can align long enough for a hazard trajectory to pass through.

For executives, the model changes the first question after an incident. “Who made the error?” is too narrow to explain why that act became consequential. The investigation must also examine information, alarms, staffing, maintenance, handoffs, incentives, supervision, technical barriers, and recovery mechanisms that were expected to stop or absorb the failure.

Swiss Cheese Model — Find the defenses that let the error through. Executive Insight Brief 349 by Bernhard Schieber.

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