Guides on assessment and psychometrics
Practical articles for HR professionals, recruiters and hiring managers who choose, use or explain tests. Written by people, with sources where they matter.
Reliability and validity: what HR professionals need to know
What reliability and validity mean when you choose an assessment: types of reliability, measurement error, validity for a use, and questions for vendors.
Norm groups: how to interpret a test score
What norm groups are, how percentiles, stens, stanines and T-scores relate, and how to choose and check the right norm before you read a test report.
The Big Five personality model in hiring
How to use Big Five personality scores in recruitment: what each trait means at work, what research shows, role profiles, common pitfalls and good practice.
Cognitive ability tests in recruitment
What numerical, verbal and abstract reasoning tests measure, what current research says about their validity, and how to use them fairly in hiring.
The EU AI Act and assessments in recruitment
What the EU AI Act means for assessments in recruitment: when a test is high-risk AI, what vendors and employers must do, and the current timeline.
How to judge the quality of a psychological test
How to judge a psychological test with the COTAN criteria and the EFPA Test Review Model, plus a practical checklist for reading a vendor's technical manual.
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