Correctness

In the context of accessibility evaluation, correctness (also called precision) is the proportion of reported accessibility problems that are true problems — that is, issues that genuinely affect users with disabilities rather than false positives. A high correctness rate means that when an evaluator identifies a barrier, it is very likely to be a real accessibility issue. Correctness is one of several quality metrics used to compare and benchmark accessibility evaluation methods, alongside sensitivity (recall), reliability, and efficiency. An evaluation method with low correctness wastes resources by directing attention to non-issues.