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The risk is considered As Low As Reasonably Practicable when it is possible to demonstrate that the cost involved in reducing the risk further would be grossly disproportionate to the benefit gained, and therefore ALARP is common practice of judgment of the balance of risk and societal benefit.
To determine if risk is ALARP cost-benefit analysis should be made to compare the risk assessed with the money, time and efforts needed to mitigate it.
ALARP can be considered as an attribute of goal-setting legislation versus prescriptive one and in former the duty holder (say, employer) is responsible to demonstrate to the regulator that the risk to the personnel is ALARP.
I would definitely say that ALARP principle is the “Friend” of safety and risk management.