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Scales of severity and extent used in an OCLC heuristic evaluation


Methodology  |  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