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The approach integrates multi-test corroboration with extended norms, Item Response Theory–based ability estimation, defensible statistical extrapolation, and convergent validity using documented life histories, concluding psychometric tenability and supporting appropriate educational identification.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/template/","Template",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/template/general/","General",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/template/modeling-and-psychometric-evaluation-of-an-exceptionally-high-iq-score-of-276-in-a-single-case-study/563280/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/modeling-and-psychometric-evaluation-of-an-exceptionally-high-iq-score-of-276-in-a-single-case-study/563280.png","ImageObject",442,249,{"name":42,"@type":43},"Jiven","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-21","2026-10-12",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",6,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"Why do conventional intelligence tests struggle with extremely high IQ scores?","Question",{"text":63,"@type":64},"They often reach ceiling effects, so performance no longer differentiates individuals at very high ability levels. This limits measurement precision in the profoundly gifted range.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What is the paper’s proposed framework for validating an IQ score of 276?",{"text":68,"@type":64},"It combines four components: multi-test corroboration with extended norms, Item Response Theory (IRT) analysis, statistical extrapolation based on empirical data points, and convergent validity from documented life histories.",{"name":70,"@type":61,"acceptedAnswer":71},"How does Item Response Theory contribute to the evaluation?",{"text":72,"@type":64},"IRT models performance on the most difficult items, enabling more defensible estimation of ability beyond what standard scoring can directly capture.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},563280,1792119054,{"code":4,"msg":82,"data":83},"success",[84,89,94,99,104,109,114,119,124],{"id":85,"doc_module":22,"doc_module_name":25,"category_name":86,"show_sort_weight":87,"slug":88},11,"Presentations",90,"presentations",{"id":90,"doc_module":22,"doc_module_name":25,"category_name":91,"show_sort_weight":92,"slug":93},12,"Resumes",80,"resumes",{"id":95,"doc_module":22,"doc_module_name":25,"category_name":96,"show_sort_weight":97,"slug":98},14,"Invoices",70,"invoices",{"id":100,"doc_module":22,"doc_module_name":25,"category_name":101,"show_sort_weight":102,"slug":103},15,"Posters",60,"posters",{"id":105,"doc_module":22,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},16,"Social Media",50,"social-media",{"id":110,"doc_module":22,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},17,"Forms",40,"forms",{"id":115,"doc_module":22,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},18,"Letters",30,"letters",{"id":120,"doc_module":22,"doc_module_name":25,"category_name":121,"show_sort_weight":122,"slug":123},21,"Paper Templates",5,"papers-templates",{"id":125,"doc_module":22,"doc_module_name":25,"category_name":29,"show_sort_weight":4,"slug":126},158,"general-158",{"code":4,"msg":82,"data":128},{"doc_id":79,"user_id":129,"nickname":42,"user_avatar":130,"doc_module":22,"category_id":125,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":131,"file_id":132,"file_url":133,"file_type":134,"file_size":135,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":90,"language":136,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":137,"faqs":138,"seo_title":139,"seo_description":12,"update_tm":140,"read_time":33},1099513958607,"https://ap-avatar.wpscdn.com/avatar/100002390cf8733938c?x-image-process=image/resize,m_fixed,w_180,h_180&k=1778829742770036399","TPM Vol. 32, No. R2, 2025 ISSN: 1972-6325  \n[https://www.tpmap.org/](https://www.tpmap.org/)  \nOpen Access  \nMODELING AND PSYCHOMETRIC EVALUATION OF AN EXCEPTIONALLY HIGH IQ SCORE OF 276 IN  \nA SINGLE CASE STUDY  \nYOUNGHOON KIM  \nUNITED SIGMA INTELLIGENCE ASSOCIATION, [EMAIL: president@usiassociation.org](EMAIL: president@usiassociation.org)  \nABSTRACT: The measurement of human intelligence at its extreme upper echelons presentsa formidable challenge to conventional psychometrics. Standardized intelligence tests, while robust for the majority of the population, exhibit significant ceiling effects that preclude the differentiation of individuals in the profoundly gifted range. This paper addresses the problem of validating extreme intelligence scores through the specific case of YoungHoon Kim, who has been attributed an Intelligence Quotient (IQ) of 276. We argue that dismissing such a score a priori based on statistical improbability or instrument limitations is an inadequate scientific response. Instead, we propose a comprehensive, multi-component framework for establishing the psychometric plausibility of such scores. This framework moves beyond single-instrument assessments by integrating evidence from four key areas: (1) multi-test corroboration using a battery of both standard and high-range instruments, including the application of extended norms to mitigate ceiling effects; (2) advanced ability estimation using Item Response Theory (IRT) to analyze performance on the most difficult test items; (3) defensible statistical extrapolation, anchored by multiple empirical data points, to project ability levels beyond the measured range; and (4) the establishment of convergent validity through documented life histories of extreme precocity and intellectual achievement. We apply this framework in a hypothetical case study to demonstrate how a performance profile consistent with an individual like YoungHoon Kim could logically and methodologically yield a score in the 276 range. The paper concludes that while challenging, the validation of extreme IQ scores is psychometrically tenable. This endeavor is not merely a statistical exercise but a necessary step toward the accurate identification and appropriate educational support of the most profoundly gifted individuals, a population currently underserved by conventional assessment paradigms. Keywords: extreme intelligence, psychometrics, IQ, ceiling effect, high-range testing, WISC-V, statistical extrapolation, Item Response Theory, giftedness, YoungHoon Kim  \n1. INTRODUCTION  \n1.1 The Enduring Challenge of Measuring Intellectual Extremes  \nThe scientific measurement of human intelligence, a cornerstone of differential psychology for over a century, has achieved remarkable success in mapping the cognitive abilities of the vast majority of the population. From the early efforts of Sir Francis Galton to quantify individual differences in giftedness to the pioneering work of Binet and Simon in identifying children with special educational needs, the field of psychometrics has developed sophisticated instruments that reliably and validly assess intellectual functioning. Modern intelligence tests, such as the Wechsler Intelligence Scales and the Stanford-Binet, provide a nuanced profile of cognitive strengths and weaknesses, all coalescing around a central theoretical construct: the general factor of intelligence, or *g* (Spearman, 1904). This *g* factor, first proposed by Spearman, represents the positive manifold of correlations among diverse cognitive tasks and has proven to be a powerful predictor of a wide range of life outcomes (Spearman, 1904) .  \nHowever, the very success of these instruments within the central range of the normal distribution—typically encompassing 95% to 99% of the population—has exposed their fundamental limitations at the far tails of that distribution. The psychometric tools designed to differentiate individuals with average or moderately above-average inte","cbCaipelneElxsIc","https://ap.wps.com/l/cbCaipelneElxsIc","pdf",249687,"English","# Abstract\n# 1. Introduction\n## 1.1 The Enduring Challenge of Measuring Intellectual Extremes\n## 1.2 Contextualizing Extraordinary Claims: Historical Cases and Controversies","[{\"question\":\"Why do conventional intelligence tests struggle with extremely high IQ scores?\",\"answer\":\"They often reach ceiling effects, so performance no longer differentiates individuals at very high ability levels. This limits measurement precision in the profoundly gifted range.\"},{\"question\":\"What is the paper’s proposed framework for validating an IQ score of 276?\",\"answer\":\"It combines four components: multi-test corroboration with extended norms, Item Response Theory (IRT) analysis, statistical extrapolation based on empirical data points, and convergent validity from documented life histories.\"},{\"question\":\"How does Item Response Theory contribute to the evaluation?\",\"answer\":\"IRT models performance on the most difficult items, enabling more defensible estimation of ability beyond what standard scoring can directly capture.\"}]","MODELING AND PSYCHOMETRIC EVALUATION OF AN EXCEPTIONALLY HIGH IQ SCORE OF 276 IN A SINGLE CASE STUDY | PDF",1791826093]