Who is known as the father of the modern IQ test?

• A. Alfred Binet
• B. Lewis Terman
• C. David Wechsler
• D. Robert Sternberg

Answer: (B)

The main idea is how intelligence testing became standardized and widely used to quantify IQ. Lewis Terman took the foundational work of Binet and transformed it into a standardized, widely normed instrument—the Stanford-Binet. He expanded and refined the test for more ages, established clear administration procedures, and introduced the intelligence quotient concept (IQ) as a standard score derived from mental age relative to chronological age. This combination of a reliable, scalable test with a consistent scoring method across age groups is what defines the modern approach to IQ testing, shaping how psychologists and educators measure intelligence today. Alfred Binet began the process by creating the first practical test, while David Wechsler and Robert Sternberg contributed important later ideas and tools, but the enduring model that set the standard for modern IQ testing is Terman’s Stanford-Binet work.