Swiss cheese model

The "Swiss cheese model" refers to a theory of accident causation that likens layers of defense against disaster to slices of Swiss cheese. Though each slice has holes or weaknesses, when stacked together, the likelihood of a problem passing through all layers and causing a catastrophe is reduced.

Roger Seheult discussed this model in the context of COVID-19 treatment. He explained that although each safety measure, like masks or vaccines, is imperfect by itself, combining these safety precautions layers (like slices of Swiss cheese) minimizes the risk of undesired outcomes like infection transmission. This model emphasizes that no single intervention is foolproof, and multiple strategies should be implemented in combination to ensure the best possible protection 1.