The useful starting point
Compare definitions and underlying scenarios before comparing scores; identical numbers can represent different assumptions.
Two worksheets use the same number
A learner receives two fictional worksheets. Form A records a likelihood value of 2 and Form B also records 2. The learner concludes that both situations are equally likely. A closer look shows that Form A calls its second category “occasional,” while Form B calls its second category “unlikely.” Neither file defines the time period.
CCOHS emphasizes defined parameters when using risk-rating methods. In this exercise, the number is a label within a particular scale. It cannot be interpreted reliably without the definition attached to that scale.
Ask what the category actually means
The words “occasional” and “unlikely” are not enough by themselves either. Occasional per task, per month or across the life of a project could mean different things. The case also omits the exposure pattern and the scenario used for the consequence category.
A useful review does not repair those omissions by selecting whichever interpretation produces a preferred score. It records the missing definitions. If a later question supplies them, you can compare the underlying statements instead of comparing the printed numbers alone.
Use a scale-comparison worksheet
| Comparison item | Form A | Form B |
|---|---|---|
| Printed likelihood value | 2 | 2 |
| Category wording | Occasional | Unlikely |
| Time or exposure basis | Not supplied | Not supplied |
| Consequence definition | Not supplied | Not supplied |
| Comparison supported? | Not from the number alone | Definitions must be reconciled |
The table intentionally stops before calculating a score. Arithmetic cannot supply definitions that the problem has omitted.
A matching total can conceal different stories
Imagine a separate mathematics-only example where two factors are multiplied. A pair of 2 and 3 gives the same product as 3 and 2. The matching total does not make the factors identical. If the factors represent different dimensions, the explanation still needs both dimensions.
This arithmetic observation does not establish how a real organization should rank or accept risk. It simply shows why a total should not replace the scenario description. Two entries can share a displayed result while needing different evidence and different discussions.
Answer without pretending the matrix decides everything
A strong study answer says, “The values are not directly comparable until the scales, time basis and underlying scenarios are understood.” It does not claim that every matrix is useless or that numbers should never be used. The problem is an unsupported comparison.
For practice, take a fictional rating and write the explanation in plain language without its number. If you cannot describe the assumed exposure and consequence, the number is carrying more meaning than the evidence supports. Keep that lesson separate from any workplace's required assessment method, escalation rules or decision authority.
Check your reasoning.
Two forms both show likelihood 2, but use different category definitions. Is “the likelihood is equal” a supported conclusion?
Open the suggested reasoning
No. The shared number is only a label within each scale. The definitions, exposure basis and scenarios must be understood before the ratings can be compared.
An original learning exercise from NCSO Prep, not an official exam question.
Sources and scope
Source review: . The examples and study methods are NCSO Prep editorial material. Official requirements and workplace decisions must be checked against the applicable current source.
- CCOHS: Risk Assessment
Risk-assessment context; this page's case and worksheet are original learning aids. Reviewed October 18, 2026.