Cognitive ability testing
What ability tests predict, where cut-offs fail, and how to use them fairly in hiring and development.
2 November 2026 · 10 min read
Adverse impact in cognitive testing: the ratio is not the finding
The four-fifths rule flags noise and misses real gaps. How to read a stage-level funnel, add a significance test, and document the call.
1 November 2026 · 8 min read
Adaptive versus fixed difficulty tests: what actually changes
Adaptive testing buys precision per item and spends review, predictable length and a score the candidate can estimate. How to choose between the three designs.
28 October 2026 · 9 min read
Your cognitive ability cut-off is doing less work than you think
Cognitive ability predicts job performance at .22 to .31, not the .51 in the vendor deck. How to set a defensible floor, band scores and spot when a test stops ranking.
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