What does Alarp

The ALARP concept

The ALARP concept is a method of risk reduction. The procedure is used, for example, in risk management, but also in risk assessments and hazard analyzes. According to the ALARP concept, hazards and risks are to be reduced to a level that guarantees the maximum degree of safety that is reasonably practicable (ALARP = "As Low As Reasonable Practicable").

In product development, this means, for example, that risk reduction measures for identified risks only have to be implemented if they are also reasonably practicable (financially and / or technically feasible with reasonable effort). Of course, this always goes hand in hand with considering the extent of the damage and its probability of occurrence.

ALARP principle in risk assessment

As part of a risk assessment, the hazards of a machine or system are determined and evaluated. This is often done with the help of a risk graph (RISK MATRIX). With the help of an F-N curve, it is then possible to visualize very clearly which risks are in the acceptable range, which are in the ALARP range and which are in the unacceptable range. In an F-N curve, the two parameters Probability of occurrence and Extent of damage merged.


F-N curve with ALARP area

Existing hazards are identified, assessed and evaluated in a risk assessment. About the evaluation of the sizes Probability of occurrence and Extent of damage there is a classification for each individual risk in the risk graph. If a risk is in the unacceptable range, mitigation must be performed until the risk falls into the ALARP range. If this is not possible, a cost-benefit analysis must be used to determine whether the expected benefit outweighs the risks.