Updated 2026-09-16
Predictive validity measures how well a hiring method — such as a structured interview, work sample, or cognitive test — forecasts actual on-the-job performance, typically expressed as a correlation coefficient between assessment scores and later job metrics.
A smooth, friendly interview process that does not predict who succeeds wastes hire budget and increases regrettable turnover. Recruiting teams optimise for time-to-fill and candidate NPS, but the economic case for structured methods rests on validity — hiring people who perform, stay, and grow.
Industrial-organisational psychology meta-analyses consistently rank work samples and structured interviews among stronger predictors for many roles, while unstructured interviews and years-of-experience heuristics rank weaker. Validity is never perfect — measurement noise, job changes, and rater error all limit correlation — but method choice materially shifts odds.
Predictive validity is role-specific. A structured behavioural screen validated for contact center performance does not automatically validate for staff nurse clinical judgment. Job analysis and local validation studies strengthen defensibility when selection methods face compliance scrutiny.
| Method | Typical validity note |
|---|---|
| Work sample / job trial | Strong when feasible — observes actual task performance |
| Structured behavioural interview | Consistently stronger than unstructured formats in meta-analyses |
| Cognitive ability tests | Strong for complex roles; adverse impact risk requires monitoring |
| Unstructured interview | Weaker predictor; higher bias vulnerability |
| Resume pedigree alone | Weak for many roles — proxy for opportunity, not skill |
In hiring research, correlations above 0.30 for a single method are considered practically meaningful. Real-world programmes compound multiple methods.
Validity depends on rubric design, role fit, and vendor-specific validation studies — not the label 'AI.' Ask vendors for criterion-related validity evidence for roles like yours.
Evidence-based hiring chooses methods with documented validity and fairness trade-offs for the specific role, rather than tradition or intuition alone.
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