Measurement of Intelligence

Overview

Measurement of intelligence is a foundational topic in Child Development and Pedagogy that directly impacts how teachers identify learners' cognitive abilities and plan differentiated instruction. For JKTET, you must understand what Intelligence Quotient (IQ) means, how it is calculated, and the major intelligence tests used in educational and psychological settings.

This topic connects closely with theories of intelligence (Spearman, Thorndike, Thurstone, Gardner) and has practical implications for identifying children with special needs, gifted learners, and those requiring remedial support. Expect questions on IQ formulas, types of intelligence tests, and the educational uses and limitations of intelligence testing. Questions often test whether you can distinguish between verbal and performance tests, individual and group tests, and understand why a single IQ score cannot capture the full range of human abilities.

Key Concepts

• **Intelligence Quotient (IQ)** is a numerical measure of intelligence derived by comparing an individual's mental age with their chronological age, expressed as a ratio or deviation score.

• **Mental Age (MA)** refers to the level of intellectual functioning compared to the average performance of children at various ages. A child with MA of 10 performs at the level typical of 10-year-olds.

• **Chronological Age (CA)** is the actual age of the individual in years and months from birth.

• **Deviation IQ** is the modern method where IQ is calculated based on how far an individual's score deviates from the mean of their age group, with mean set at 100 and standard deviation typically at 15.

• **Verbal tests** measure intelligence through language-based tasks like vocabulary, comprehension, and verbal reasoning.

• **Performance tests** (non-verbal tests) measure intelligence through tasks that do not require language, such as block design, picture arrangement, and pattern completion—useful for testing children with language barriers.

• **Individual tests** are administered one-on-one by a trained psychologist, providing detailed assessment but requiring more time and resources.

• **Group tests** can be administered to many people simultaneously, making them efficient for large-scale screening but less detailed.

Formulas / Key Facts

**Classic IQ Formula (Ratio IQ):** IQ = (Mental Age / Chronological Age) × 100

Example: A child aged 8 years with mental age of 10 years has IQ = (10/8) × 100 = 125

**Deviation IQ Formula:** IQ = 100 + 15 × [(Individual Score - Mean Score) / Standard Deviation]