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Scales of severity and extent used in an OCLC heuristic evaluationMethodology | Fourteen heuristics
Severity
| Rating |
Description |
| 1 |
Major usability problem: IMPERATIVE to fix now |
| 2 |
Major usability problem: important to fix now |
| 3 |
Minor usability problem: give low priority |
| 4 |
Cosmetic problem only: need not be fixed now |
| 5 |
I don't agree this is a usability problem at all |
Extent
| Rating |
Description |
| 1 |
Widespread |
| 2 |
Several places |
| 3 |
Single case |
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