Explain the Swiss Cheese Model of accident causation and its relevance to interprofessional safety.

• A. Multiple layers of defense may have holes; when holes align due to active failures and latent conditions, errors occur; teamwork adds defenses through diverse minds and checks.
• B. A model about cheese consumption in hospitals.
• C. A model focusing on single-point of failure.
• D. A model that relies on personal blame.

Answer: (A)

The Swiss Cheese Model shows that safety in complex systems rests on multiple layers of defense, each with its own weaknesses. Each layer is like a slice of cheese with holes. An incident occurs when holes in several layers line up, creating a path for a hazard to pass through all defenses. These holes come from active failures—the frontline mistakes people make—and latent conditions—systemic issues such as design flaws, understaffing, poor procedures, or gaps in training.

In interprofessional safety, teamwork strengthens defenses because different professionals bring distinct perspectives, checks, and communication that catch issues others might miss. When orders, medications, and patient data flow across roles, each handoff and verification step adds a barrier. For example, a correct prescription must be interpreted, validated by a pharmacist, accurately prepared, and then checked against patient identifiers and allergies before administration. The more layers and checks that exist, the less likely the holes will align to cause harm.

This model shifts focus from blaming individuals to improving the system: designing clear processes, fostering open communication, and creating redundancies and safeguards that reduce latent weaknesses. In essence, strong interprofessional collaboration reshapes the cheese, filling gaps and lowering the chance that an error slips through.