I know IQ testing has been around for a while, but I’m curious about when it actually started. Was there a specific year or person who created the first official IQ test? And was it always used the way we use it today, or did the original purpose look different?
Also, how did IQ testing evolve from its early versions to what we have now with tests like the WAIS and Stanford-Binet? Just trying to get a sense of the history and timeline behind intelligence testing.
The first modern IQ test was created in 1905 by Alfred Binet and Theodore Simon in France. They were hired by the French government to identify students who needed extra educational help. The original test was nothing like today’s, it measured things like memory, attention, and problem-solving to spot kids struggling in school. The term “IQ” came later in 1912 when William Stern created the Intelligence Quotient formula. Lewis Terman adapted it for Americans in 1916 (Stanford-Binet), and that’s when IQ testing really took off in the US.
1905 is the birth year, Alfred Binet and Theodore Simon made the first practical intelligence test in France to help struggling students. But Binet actually hated the idea of reducing intelligence to one number and warned against using it to rank people. The “IQ score” itself was invented by William Stern in 1912. Over time, it evolved into tools like the Stanford-Binet (1916) and eventually the WAIS. The original purpose was supportive and educational, but it got twisted into classification and ranking, exactly what Binet feared.
The first modern intelligence test was created by Alfred Binet and Theodore Simon in 1905. They didn’t call their test and “IQ test” because the term “IQ” (which stood for “intelligence quotient”) would not be coined until after Binet’s death. But the test has many characteristics recognizable today on modern intelligence tests: arranging items from easiest to hardest, basing the scoring system on age, and asking examinees to reason abstractly.
Binet’s test was adapted and expanded in 1916 in the United States into the “Stanford-Binet,” a test which is still in existence today. The Wechsler tests, like the WAIS, have a different history that emerges from David Wechsler’s work at the Bellevue hospital in NYC. But Wechsler was definitely aware of the Stanford-Binet and used his knowledge of the test to imitate it where it functioned well and improve upon it when it didn’t.
For more information about the history of IQ testing, check out my book, In the Know: Debunking 35 Myths About Human Intelligence, available here, here, or here.
@VeronicaTale What about the role of the French educational system at the time? Was Binet’s desire to help struggling students solely benevolent, or was it also an attempt to efficiently identify and separate those who would require different state resources?
It’s true, modern clinical practice looks very different. Today, we use tests like the WAIS-IV as part of comprehensive assessments and never in isolation. They help us identify specific cognitive strengths and weaknesses, diagnose learning disabilities, and evaluate cognitive changes due to injury or neurological conditions.
The key evolution is that we now understand intelligence as multifaceted. Current tests measure different domains rather than giving just one number. And ethical practice requires considering cultural context, language background, and testing conditions when interpreting results.
Right. In my practice, I use IQ testing as one data point. It’s helpful for identifying cognitive patterns and eligibility for services, but I’d never reduce someone’s potential or worth to a number. The evolution of IQ testing is really a story of psychology slowly learning humility about what we can and can’t measure about human intelligence.
@dwight_farooqi128 I think we often romanticize Binet’s warnings too much. While he was ethically cautious, his tool itself was structurally prone to ranking. Once you have a metric that measures capacity, it’s virtually impossible to prevent people from using it to compare individuals, even if your only goal is to find the bottom 10% for support. The very act of measurement invites hierarchy, regardless of the best intentions of the inventor.