Reporter's notebook: Reexamining the Swiss cheese model

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Reporter's notebook: Reexamining the Swiss cheese model - CBS News

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Renowned psychology professor James Reason, who popularized what is known as the Swiss cheese model, has died. Mistakes, Reason theorized, were really a series of vulnerabilities lining up, like a single hole might in a stack of individual slices of Swiss cheese. John Dickerson explains.

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