Measurement of Intelligence

Overview

Measurement of intelligence is a foundational topic in Child Development and Pedagogy that directly connects psychological theory to classroom practice. For CG TET, you must understand how intelligence is quantified, the major tests used, and—most importantly—how teachers should interpret and apply these measurements in educational settings.

This topic typically appears as 1-2 questions in the exam, often testing your knowledge of IQ calculation, famous intelligence tests and their developers, or the limitations and proper use of intelligence testing in schools. Questions may also link this concept to inclusive education, asking how teachers should respond to children with varying intelligence levels without labelling or discrimination.

Mastering this topic requires you to move beyond rote memorisation of test names. Focus on understanding the concept of Mental Age versus Chronological Age, the IQ formula, classification of intelligence levels, and the pedagogical implications—especially the caution against using IQ scores to permanently categorise children.

Key Concepts

• **Intelligence Quotient (IQ)** is a numerical score representing an individual's cognitive ability relative to their age group. It is not a fixed, unchangeable trait but can be influenced by environment and education.

• **Mental Age (MA)** refers to the intellectual level at which a child functions, regardless of their actual age. A child with MA of 10 means they perform intellectually like an average 10-year-old.

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

• **Individual tests** are administered one-on-one by trained psychologists and provide detailed assessment (e.g., Stanford-Binet, WISC).

• **Group tests** can be administered to many people simultaneously, are time-efficient but less detailed (e.g., Army Alpha, Army Beta tests).

• **Verbal tests** require language ability—reading, writing, or speaking. They may disadvantage children from different linguistic backgrounds.

• **Non-verbal/Performance tests** use pictures, puzzles, and patterns, making them fairer for children with language barriers or hearing impairments.

• **Culture-fair tests** attempt to minimise cultural and linguistic bias by using universal symbols and patterns (e.g., Raven's Progressive Matrices).

Formulas / Key Facts

**IQ Formula (Ratio IQ by Stern and Terman):** IQ = (Mental Age / Chronological Age) × 100

Example: A child aged 10 years with mental age of 12 years has IQ = (12/10) × 100 = 120