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Measures of Intelligence

Measures of Intelligence

Psychologists measure intelligence by using standardized tests that produce a score known as the intelligence quotient or IQ. To understand IQ tests, it's important to recognize the key principles behind their construction: validity, reliability, and standardization.
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Wechsler's Contribution to Measures of Intelligence

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David Wechsler, a psychologist who worked with World War I veterans, developed a significant IQ test in 1939 called the Wechsler-Bellevue Intelligence Scale. This test was innovative because it combined several subtests that measured both verbal and nonverbal skills, reflecting Wechsler's belief that intelligence is a global capacity involving purposeful action, rational thinking, and effective interaction with the environment. This test later evolved into the Wechsler Adult Intelligence Scale...

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Related Experiment Video

Updated: Jun 26, 2026

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Published on: September 11, 2021

From Incremental Validity to Decision Utility: A Framework for Intelligence Testing in Education.

Liliana Pedraja-Rejas¹, Carmen Araneda-Guirriman¹, Emilio Rodríguez-Ponce²

¹Departamento de Ingeniería Industrial y de Sistemas, Facultad de Ingeniería, Universidad de Tarapacá, Arica 1000000, Chile.

Journal of Intelligence

|June 25, 2026

Summary

This summary is machine-generated.

Intelligence testing offers value in education but should be used conditionally. A new framework guides when to use cognitive assessments, prioritizing achievement and context first for better educational decisions.

Keywords:

academic achievement decision utility educational placement incremental validity intelligence testing measurement comparability

Related Experiment Videos

Last Updated: Jun 26, 2026

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Problem-Solving Before Instruction (PS-I): A Protocol for Assessment and Intervention in Students with Different Abilities

Published on: September 11, 2021

Area of Science:

Educational Psychology
Decision Analysis
Psychometrics

Background:

Intelligence tests predict academic achievement, but their educational application is debated.
Existing methods lack a framework to evaluate the utility of intelligence testing beyond grades and achievement measures.

Purpose of the Study:

To develop a decision-analytic framework for evaluating the value of intelligence testing in educational decision-making.
To distinguish between incremental validity and decision utility in the context of cognitive assessment.

Main Methods:

Development of a staged decision architecture.
Integration of psychometric scholarship and a generative account of achievement.
Analysis of decision scenarios considering base rates, constraints, error costs, fairness, and legitimacy.

Main Results:

Identified conditions where intelligence testing is most informative: educational transitions, uneven opportunity contexts, and discrepancy-focused decisions (e.g., underachievement, twice-exceptionality).
Specified minimum conditions for responsible use, including intended use, construct representation, reliability, comparability, bias checks, and distributional impact monitoring.

Conclusions:

Intelligence testing should be used conditionally and sequentially.
Cognitive assessment should supplement, not replace, achievement and contextual indicators, and be added only when likely to alter the decision.