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*Updated June 9, 2026*

On High-Range Test Construction Now: Psychometrics, IQ Test Validity, and the Limits of Extreme Intelligence Scores (PDF)

Publication Date: June, 2026; Edition: 1st; Formats: EPUB, Apple Books, PDF, Kindle.

ISBN: 978-1-0673505; Document Word Count: 108,894 Language: English.

Introduction: Scott Douglas Jacobsen

On High-Range Test Construction Now: Psychometrics, IQ Test Validity, and the Limits of Extreme Intelligence Scores is a psychometric interview-and-commentary collection by Scott Douglas Jacobsen that treats high-range intelligence testing not as a theatre of numerical prestige but as a fragile, technical, and culturally revealing attempt to measure unusual cognitive ability at the edges of validity. Across interviews, essays, and historical reflections with figures including Hindemburg Melão Jr., Iakovos Koukas, Chris Cole, Bob Williams, Rick Rosner, Dr. Ronald K. Hoeflin, Paul Cooijmans, Marco Ripà, Roberto Enea, Patrick Liljegren, and Dr. Kristóf Kovács, the volume moves through test construction, norming, score inflation, the Flynn Effect, item quality, statistical limits, test security, high-IQ society culture, artificial intelligence, and the recurrent confusion between intelligence, IQ, and IQ-test scores. The book’s governing insight is that extreme scores require proportionate skepticism: a high ceiling is not the same as construct validity, rarity is not proof of meaning, and difficulty alone does not make a test psychometrically sound. What unifies the volume is a sympathetic but disciplined realism toward high-range testing: the field contains ingenuity, archives, intellectual play, and genuine attempts at measurement, but also overclaiming, fragile samples, compromised instruments, theatrical fraud, and interpretive drift. In that sense, On High-Range Test Construction Now reads as both documentary record and methodological warning – part intellectual history of a niche testing culture, part civic-scientific brief for why precision, transparency, fairness, humility, and independent validation remain indispensable if intelligence is to be studied rather than merely mythologized.

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