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Why is there a safety life-cycle for automation systems?

The safety life-cycle, sometimes spelled lifecycle, was conceived after the Health and Safety Executive (HSE - a UK government agency) found that accidents involving control systems could be attributed to various different root causes.

The highest root cause of accidents was found to be poor specification of the system (44% of cases), followed by modification after commissioning (20%), and then poor operation or maintenance (15%). 

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