How Much Credit for Alarms?

“Morning comes whether you set the alarm or not.”  — Ursula K. Le Guin Late one evening a few months after we moved into our offices on Cherokee Street, the alarm went off. My home is nearby, and I got there within a couple of minutes to discover that one of the doors had been [...]

Out of the Blocks: Credit for Human Response

“Fear is often our immediate response to uncertainty.”  — Gabrielle Bernstein In 2001, when the CCPS book, Layer of Protection Analysis: Simplified Process Risk Assessment, “the purple book”, stated that human response is “a relatively weak protection layer” and “less reliable than engineering controls”, many people were willing to accept that piece of conventional wisdom. [...]

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