4 x 4 Likelihood v Severity

There are several versions of the likelihood v severity descriptions, and the below is just one of the more common versions.

Risk Rating

Risk Rating is calculated by multiplying the likelihood against the consequences, e.g. taking a likelihood of 4, which is classified as Probable, and multiplying this against a consequence of 2, which is classified as a Minor Injury 1st aid required, would give you and overall risk rating of 8, which would be risk rated as a low risk.

Risk Matrix

The 4 x 4 Risk Assessment Matrix The colours red, amber, yellow and green reflect varying levels of overall risk with green and yellow being generally acceptable (normally subject to monitoring), amber being of cause for caution and concern and red being of significant concern. The matrix sets out the suggested criteria for assessing the likelihood and consequences to produce an overall score. Risk Rating is calculated by multiplying the likelihood against the consequences, e.g. taking a likelihood of 3 which is classified as Probable (not surprised, will occur in given time), and multiplying this against a consequence of 2 which is classified as a Minor Injury (hazard can cause illness, injury or equipment damage but the results would not be expected to be serious), would give you and overall risk rating of 6, which is the first risk rating to be classified as a medium- high. Risk levels equates to... Suggested actions as to what do with the Risk Rating. If the Risk Rating is between 01-04. Continue with existing control, however monitor for changes 05-08. Requires attention to reduce the rating and regular ongoing monitoring 09-12. Requires immediate attention to bring the risk down to an acceptable level 13-16. Stop immediately? Risk is too high and not acceptable TIRA - Task Inventory and Risk Assessments Windows based Risk Assessment Software Sample of a risk assessment input form used in the TIRA software TIRA takes the hard work out of risk assessing and simplifies the risk assessors workload.  TIRA helps the risk assessor complete the following occupational health and safety risk assessments: 1. Task Inventory (break the task down) 2. Task Based (general risk assessments) 3. Display Screen Equipment (DSE) 4. Manual Handling 5. Work Equipment 6. Workplace 7. Hazardous Substances 8. Fire Premises 9. First Aid 10. Personal Protective Equipment (PPE)