RISK RATING TABLE - H & S Risk Assessment

A simple risk rating table

	Slightly harmful	Harmful	Extremely harmful
Highly unlikely	TRIVIAL RISK	TOLERABLE RISK	MODERATE RISK
Unlikely	TOLERABLE RISK	MODERATE RISK	SUBSTANTIAL RISK
Likely	MODERATE RISK	SUBSTANTIAL RISK	INTOLERABLE RISK

Risk = Severity x Likelihood 

Severity of harm may be rated

Rating	Description
3	Major: Death or major injury or illness causing long term disability
2	Serious: Injuries or illness causing short-term disability
1	Slight: All other injuries or illnesses

Likelihood of harm may be rated

Rating	Description
3	High: Where it is certain that harm will occur
2	Medium: Where harm will often occur
1	Low: Where harm will seldom occur

Risk = Severity of Harm x Likelihood of Occurrence

Evaluating Risk and the Adequacy of Existing Controls

Determine risk

The risk from the hazard should be determined by estimating the potential severity of harm and the likelihood that harm will occur by considering the adequacy of any existing controls.

Severity of harm

Information obtained about work activities is a vital input to risk assessment. When seeking to establish potential severity of harm, the following should also be considered:

• Part(s) of the body likely to be affected; 
• Nature of the harm, ranging from slightly to extremely harmful:

1. slightly harmful, e.g.: superficial injuries; minor cuts and bruises; eye irritation from dust;nuisance and irritation (e.g. headaches); ill-health leading to temporary discomfort; 
2. harmful, e.g.lacerations; burns; concussion; serious sprains; minor fractures;deafness; dermatitis; asthma; work related upper limb disorders; ill-health leading to permanent minor disability:
3. extremely harmful, e.g.amputations; major fractures; poisonings; multiple injuries; fatal injuries; occupational cancer; other severely life shortening diseases; acute fatal diseases.

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