matrix_size,severity_level,severity_descriptor,likelihood_level,likelihood_descriptor,risk_score,risk_band,alarp_zone,recommended_action
5x5,1,Insignificant (no injury / negligible damage),1,Rare (may occur only in exceptional circumstances — less than once in 10 years),1,Very Low,Broadly Acceptable,Routine management; no special controls required; retain existing controls
5x5,1,Insignificant (no injury / negligible damage),2,Unlikely (could occur but not expected — once in 5-10 years),2,Very Low,Broadly Acceptable,Routine management; monitor periodically
5x5,1,Insignificant (no injury / negligible damage),3,Possible (might occur occasionally — once in 1-5 years),3,Low,Broadly Acceptable,Low priority; existing controls probably adequate; note for periodic review
5x5,1,Insignificant (no injury / negligible damage),4,Likely (will probably occur in most circumstances — once per year),4,Low,ALARP (Tolerable),Manage by routine procedures; ensure controls maintained
5x5,1,Insignificant (no injury / negligible damage),5,Almost Certain (expected to occur in most circumstances — more than once per year),5,Medium,ALARP (Tolerable),Moderate priority; additional controls may be justified; management responsibility
5x5,2,Minor (first aid injury / minor property damage < $10K),1,Rare,2,Low,Broadly Acceptable,Low priority; manage by routine procedures
5x5,2,Minor (first aid injury / minor property damage < $10K),2,Unlikely,4,Low,ALARP (Tolerable),Manage by routine procedures; monitor
5x5,2,Minor (first aid injury / minor property damage < $10K),3,Possible,6,Medium,ALARP (Tolerable),Moderate priority; consider additional controls; supervisor responsibility
5x5,2,Minor (first aid injury / minor property damage < $10K),4,Likely,8,High,ALARP (Tolerable),Senior management attention required; implement additional controls
5x5,2,Minor (first aid injury / minor property damage < $10K),5,Almost Certain,10,High,ALARP (Tolerable),Urgent attention; additional controls required before continuation
5x5,3,Moderate (medical treatment / significant damage $10K-$100K),1,Rare,3,Low,Broadly Acceptable,Manage by routine procedures
5x5,3,Moderate (medical treatment / significant damage $10K-$100K),2,Unlikely,6,Medium,ALARP (Tolerable),Moderate priority; specify controls; management responsibility
5x5,3,Moderate (medical treatment / significant damage $10K-$100K),3,Possible,9,High,ALARP (Tolerable),Senior management attention; additional controls required; implement within defined timescale
5x5,3,Moderate (medical treatment / significant damage $10K-$100K),4,Likely,12,High,ALARP (Tolerable),Urgent additional controls required; escalate to senior management
5x5,3,Moderate (medical treatment / significant damage $10K-$100K),5,Almost Certain,15,Very High,Intolerable,Stop activity; work must not continue until risk is reduced to ALARP
5x5,4,Major (serious injury / LTI / significant damage $100K-$1M),1,Rare,4,Low,ALARP (Tolerable),Manage by specific procedures; ensure effective controls exist
5x5,4,Major (serious injury / LTI / significant damage $100K-$1M),2,Unlikely,8,High,ALARP (Tolerable),Senior management attention; additional controls required within defined timescale
5x5,4,Major (serious injury / LTI / significant damage $100K-$1M),3,Possible,12,High,ALARP (Tolerable),Urgent; senior management action; must reduce risk as a priority
5x5,4,Major (serious injury / LTI / significant damage $100K-$1M),4,Likely,16,Very High,Intolerable,Stop activity; extensive risk reduction required before resuming
5x5,4,Major (serious injury / LTI / significant damage $100K-$1M),5,Almost Certain,20,Very High,Intolerable,Prohibit activity; fundamental redesign or alternative method required
5x5,5,Catastrophic (fatality or multiple fatalities / damage >$1M),1,Rare,5,Medium,ALARP (Tolerable),Senior management attention; ALARP demonstration required; monitor controls closely
5x5,5,Catastrophic (fatality or multiple fatalities / damage >$1M),2,Unlikely,10,High,ALARP (Tolerable),Urgent additional controls required; ALARP demonstration; escalate to management
5x5,5,Catastrophic (fatality or multiple fatalities / damage >$1M),3,Possible,15,Very High,Intolerable,Stop activity; work must not proceed without fundamental control improvement
5x5,5,Catastrophic (fatality or multiple fatalities / damage >$1M),4,Likely,20,Very High,Intolerable,Prohibit activity; Executive / Board level decision required to proceed
5x5,5,Catastrophic (fatality or multiple fatalities / damage >$1M),5,Almost Certain,25,Very High,Intolerable,Prohibit absolutely; activity cannot be performed at present design / method
4x4,1,Low severity (no / minor injury — first aid; negligible damage),1,Improbable (not expected to occur — once in 10+ years),1,Very Low,Broadly Acceptable,No immediate action; existing controls adequate
4x4,1,Low severity (no / minor injury — first aid; negligible damage),2,Remote (occurs rarely — once in 5-10 years),2,Very Low,Broadly Acceptable,Low priority; record and monitor
4x4,1,Low severity (no / minor injury — first aid; negligible damage),3,Occasional (occurs from time to time — once in 1-5 years),3,Low,ALARP (Tolerable),Manage by routine procedure; verify controls
4x4,1,Low severity (no / minor injury — first aid; negligible damage),4,Probable (expected to occur — more than once per year),4,Medium,ALARP (Tolerable),Management attention; consider additional controls
4x4,2,Medium severity (medical treatment; significant damage < $100K),1,Improbable,2,Very Low,Broadly Acceptable,Low priority; manage by routine procedure
4x4,2,Medium severity (medical treatment; significant damage < $100K),2,Remote,4,Medium,ALARP (Tolerable),Moderate priority; management review; additional controls may be needed
4x4,2,Medium severity (medical treatment; significant damage < $100K),3,Occasional,6,High,ALARP (Tolerable),Management action required; additional controls within defined timeframe
4x4,2,Medium severity (medical treatment; significant damage < $100K),4,Probable,8,High,ALARP (Tolerable),Urgent; senior management attention; priority risk reduction
4x4,3,High severity (serious injury / LTI; major damage $100K-$1M),1,Improbable,3,Low,ALARP (Tolerable),Management review; ensure ALARP; verify barriers are effective
4x4,3,High severity (serious injury / LTI; major damage $100K-$1M),2,Remote,6,High,ALARP (Tolerable),Senior management attention; additional controls required; ALARP demonstration
4x4,3,High severity (serious injury / LTI; major damage $100K-$1M),3,Occasional,9,Very High,Intolerable,Stop task; implement immediate risk reduction; executive sign-off to resume
4x4,3,High severity (serious injury / LTI; major damage $100K-$1M),4,Probable,12,Very High,Intolerable,Prohibit activity; fundamental control improvement required
4x4,4,Catastrophic (fatality or multiple fatalities; damage >$1M),1,Improbable,4,Medium,ALARP (Tolerable),Senior management attention; ALARP demonstration required; escalate
4x4,4,Catastrophic (fatality or multiple fatalities; damage >$1M),2,Remote,8,High,ALARP (Tolerable),Urgent; additional risk controls required; ALARP demonstration; executive awareness
4x4,4,Catastrophic (fatality or multiple fatalities; damage >$1M),3,Occasional,12,Very High,Intolerable,Stop activity; executive / board decision required before resuming
4x4,4,Catastrophic (fatality or multiple fatalities; damage >$1M),4,Probable,16,Very High,Intolerable,Prohibit absolutely; activity must not proceed
3x3,1,Low (minor injury / near miss; negligible damage),1,Low probability (unlikely in normal operations),1,Low,Broadly Acceptable,Acceptable risk; existing controls adequate; note for review
3x3,1,Low (minor injury / near miss; negligible damage),2,Medium probability (reasonably foreseeable),2,Low,Broadly Acceptable,Low priority; monitor; confirm controls in place
3x3,1,Low (minor injury / near miss; negligible damage),3,High probability (likely to occur),3,Medium,ALARP (Tolerable),Moderate priority; management attention; additional controls to be considered
3x3,2,Medium (medical treatment / significant injury; moderate damage),1,Low probability,2,Low,Broadly Acceptable,Low priority; manage by specific procedure; review controls
3x3,2,Medium (medical treatment / significant injury; moderate damage),2,Medium probability,4,High,ALARP (Tolerable),Management attention required; additional controls within defined timeframe
3x3,2,Medium (medical treatment / significant injury; moderate damage),3,High probability,6,High,ALARP (Tolerable),Urgent; senior management action; priority risk reduction required
3x3,3,High (fatality or serious injury; major damage),1,Low probability,3,Medium,ALARP (Tolerable),Management attention; ALARP review; ensure barriers are robust
3x3,3,High (fatality or serious injury; major damage),2,Medium probability,6,High,ALARP (Tolerable),Urgent; senior management action; additional controls; ALARP demonstration
3x3,3,High (fatality or serious injury; major damage),3,High probability,9,Very High,Intolerable,Stop activity immediately; executive approval required; fundamental redesign