RISK RATING MATRIX
LIKELIHOOD
CONSEQUENCES
Rare
Unlikely
Moderate
Likely
Almost certain
1
2
3
4
5
Minor
–1
1
2
3
4
5
Moderate
–2
2
4
6
8
10
Serious
–3
3
6
9
12
15
Major
–4
4
8
12
16
20
Fatal
–5
5
10
15
20
25
Low risk
(1 – 3)
KEY:
Moderate risk
(4 – 6)
High risk
(8 – 12)
Extreme risk
(15 – 25)
2
Moderate
3
Serious
4
Major
5
Fatal
Impact Chart
Description
First aid treatment. Low financial impact. Low environmental
implications. Some loss of reputation
Medical treatment required.
Moderate environmental
implications. Moderate financial impact. Moderate loss of
reputation. Moderate business interruption.
Serious injuries to one or more persons. Serious environmental
implications. Serious financial impact. Serious loss of reputation.
Serious business interruption.
Excessive injuries. Major environmental implications. Major
financial impact. Major loss of reputation. Major business
interruption.
Death or multiple deaths. Potential closure of the PCT
Descriptor
Rare
Unlikely
Possible
Likely
Almost Certain
Likelihood Chart
Description
The event may occur only in exceptional circumstances
The event could occur at some time
The event should occur at some time
The event will probably occur in most circumstances
The event is expected to occur
Level
1
Level
1
2
3
4
5
Descriptor
Minor
32