What does the Swiss Cheese Theory propose?

What does the Swiss Cheese Theory propose?

• A. Accidents occur when cheese is present in the workplace.
• B. A perfect system with no holes leads to accidents.
• C. Safety barriers always prevent accidents.
• D. Breakdown of components of a complete system creates holes that line up, creating an accident condition.

Answer: (D)

The idea behind the Swiss Cheese theory is that safety relies on multiple layers of defense, each with its own imperfections. Accidents happen not from a single mistake, but when the gaps or holes in these defenses line up at the right moment, allowing a hazard to pass through all the layers and cause harm. Holes come from both active failures (people mistakes) and latent conditions (design flaws, maintenance lapses, poor training, inadequate procedures). When enough holes align across the system, an accident condition emerges. So the best statement is that a breakdown of components of a complete system creates holes that line up, creating the accident condition.

The idea behind the Swiss Cheese theory is that safety relies on multiple layers of defense, each with its own imperfections. Accidents happen not from a single mistake, but when the gaps or holes in these defenses line up at the right moment, allowing a hazard to pass through all the layers and cause harm. Holes come from both active failures (people mistakes) and latent conditions (design flaws, maintenance lapses, poor training, inadequate procedures). When enough holes align across the system, an accident condition emerges. So the best statement is that a breakdown of components of a complete system creates holes that line up, creating the accident condition.