![]() The holes in the slices represent weaknesses in individual parts of the system and are continually varying in size and position across the slices. SWISH CHEESE SERIESIn the Swiss cheese model, an organisation's defenses against failure are modeled as a series of imperfect barriers, represented as slices of cheese, specifically Swiss cheese with holes known as " eyes", such as Emmental cheese. Each slice will have holes of varying sizes and positions. It is sometimes called the "cumulative act effect".Īlthough the Swiss cheese model is respected and considered to be a useful method of relating concepts, it has been subject to criticism that it is used too broadly, and without enough other models or support. Reason of the University of Manchester, and has since gained widespread acceptance. The model was originally formally propounded by James T. ![]() ![]() Therefore, in theory, lapses and weaknesses in one defense do not allow a risk to materialize, since other defenses also exist, to prevent a single point of failure. ![]() It likens human systems to multiple slices of Swiss cheese, stacked side by side, in which the risk of a threat becoming a reality is mitigated by the differing layers and types of defenses which are "layered" behind each other. The Swiss cheese model of accident causation is a model used in risk analysis and risk management, including aviation safety, engineering, healthcare, emergency service organizations, and as the principle behind layered security, as used in computer security and defense in depth. ![]()
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