Content validity is coverage, not statistics—how to prove your assessment samples the whole domain with expert review and CVR.
Content validity asks whether an assessment covers the domain it claims to measure—no blind spots, no irrelevant padding. It is established by structured expert review, not by a single number, though indices like CVR help you document it.
CVR = (Ne − N/2)/(N/2): Ne experts saying "essential" out of N reviewers.
A sales certification maps 8 exam domains against the job task list; two experts flag missing pricing-negotiation coverage—the test gains items before it gains complaints.
First line of defense for any certification, exam or job-relevant questionnaire—before you spend money on statistical validity.
One expert's endorsement is decoration. Use 3-10 reviewers, a written rating protocol, and record dissent.
Content = does it cover the domain; criterion = does it predict an outside outcome. You need content first—it's cheap.
Lawshe suggests 10+ for defensible CVR; 3-5 subject-mates is the practical floor for small programs.
Turn the concept into a live assessment：Content Validity
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