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Challenge for SIL assessment - Human error rates
By directly observing people at work, specialists in human reliability found that
there are four basic types of human failure
[1]
:
• Slip – e.g. press button “A” instead of button “B”
• Lapse – e.g. skip steps of sequence (e.g. following an interruption)
• Mistake – e.g. incorrect diagnosis of situation
• Violation – deliberate breach of rules or procedures
Ref [1] HSE Human Factors Briefing Note No. 3 Humans and Risk