Define the scenario before scoring
Define the activity, hazard, exposed people and credible unwanted event before scoring. Set clear likelihood bands and consequence levels that reflect your organization’s context, including health, safety, environment, legal, operational and financial outcomes where appropriate.
A matrix is useful only after the team describes the hazard, event and potential consequence clearly. Identify the work activity, people exposed, duration and conditions that could lead to harm. A statement such as “chemical risk” is too broad; specify the agent, route of exposure, task and credible outcome so the assessment can guide action.
Include routine work, non-routine tasks, maintenance, emergencies and changes. Ask workers what actually happens, review incidents and near misses, and examine the reliability of current safeguards. Separate a hazard from the risk scenario: the hazard is a source of potential harm; the scenario describes how exposure or an event could occur.
A risk assessment matrix is a visual tool for combining likelihood and consequence to help compare and prioritize hazards. It supports decisions, but it is only as useful as the definitions, evidence and actions behind each rating.
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Set rating scales people can use consistently
Assign a likelihood and consequence rating using available evidence such as exposure, incident history, control reliability and duration. The matrix may multiply ratings or use a lookup table to assign a category. Record why you chose each rating and what assumptions you made.
Define likelihood categories in terms that fit the organization, such as frequency of exposure or plausible event occurrence over a stated period. Define consequence bands using meaningful outcomes. If different teams interpret words like “possible” or “major” differently, the matrix will produce inconsistent results even when the underlying hazard is similar.
Choose whether the method uses a lookup table, qualitative bands or a calculation, and explain how to treat uncertainty and multiple consequences. Train assessors with examples and compare ratings across teams. Use evidence such as exposure data, incident history, control performance and expert judgment rather than treating scores as objective measurements.
Use priority to select controls
Prioritize action according to your organization’s risk criteria. Consider whether existing controls are present and effective, and identify additional measures using the hierarchy of controls. A low score should not override mandatory legal controls or a credible catastrophic scenario.
A matrix can help identify which scenarios need urgent attention, further analysis or routine management. It should not be the only decision rule. Legal requirements, credible catastrophic outcomes and vulnerable groups may require action even when a simple score appears moderate. Document existing controls and assess their real-world reliability before deciding that residual risk is acceptable.
Choose additional measures using the hierarchy of controls: eliminate or substitute hazards where feasible, then use engineering measures, administrative controls and suitable protective equipment. Assign an owner and due date, and specify how the action will be verified. A risk score without a control decision, owner and follow-up is only a record of concern.
Reassess after action and change
Reassess after controls are implemented and verify that risk has actually changed. Review ratings when work changes, new information appears or an incident occurs. Use the matrix to communicate priorities; pair it with competent judgment, worker input and specific action owners.
After controls are implemented, verify that they reduce the likelihood or consequence as intended and do not create another hazard. Record the residual risk and the evidence behind the rating. If the control is temporary or relies on frequent checks, make its review date and responsible role explicit.
Review assessments when equipment, materials, staffing, procedures or operating conditions change, and after incidents or new information. Look for patterns across assessments to identify common weak controls. The matrix should help teams talk through uncertainty and direct resources; it cannot replace competent analysis, worker involvement or a sound safety management system.