ALARP stands for As Low As Reasonably Practicable. It is a key principle in risk management used to ensure that risks are reduced to a level where further reduction would require disproportionate effort compared to the benefit gained.
In simple terms, ALARP means that organizations must take all reasonable and practical steps to reduce risk — but not to the point where the cost, time, or effort of doing so is excessively high compared to the level of risk reduction achieved.
How It Works
ALARP is based on balancing two factors:
- The level of risk
- The resources required to reduce that risk (time, cost, effort)
Organizations must demonstrate that:
- All realistic measures to reduce risk have been considered
- Any remaining risk is justified because further reduction would not be reasonably practicable
Risk Levels
The ALARP model typically divides risk into three regions:
- Unacceptable Region
Risk is too high and must be reduced regardless of cost - Tolerable (ALARP) Region
Risk is acceptable only if it has been reduced as far as reasonably practicable - Broadly Acceptable Region
Risk is low and does not require further action
Why ALARP is Important
- Helps organizations make balanced and defensible safety decisions
- Ensures resources are used effectively
- Supports regulatory compliance and safety case requirements
- Demonstrates that risks are being actively managed
Summary
ALARP is not about eliminating all risk – it is about reducing risk to a sensible and justifiable level, ensuring that safety improvements are made wherever they are reasonable and practical.