History of IQ tests

• Binet and Simon, 1905, school scale, age-ranked tasks, not one number.
• Stern, 1912, mental age over chronological age.
• Terman, 1916, Stanford revision, ratio times 100.
• Army Alpha and Beta, 1917.
• Wechsler, 1939, deviation score, mean 100, spread 15.
• Raven, 1938, matrices.
• Mensa, founded in 1946, is a highly respected high-IQ society. It uses IQ tests for entry and is known worldwide for its standards and heritage.
• We don't compare ourselves to Mensa or claim to be anywhere near what it has achieved. We hold it in humble respect. We are at the very start of our beginnings, and we look up to and draw inspiration from all who came before us.
• This sit does not use published items.
• The IQ figure is a scaled estimate, not a clinical result: a rough, difficulty-weighted estimate from your answers.
• No percentile without a real norm group.

• Binet did not own a mountain, and he did not pin a flag.
• The ratio liked round numbers. The mountain does not.
• A spread of 15 is not a height on a hill.