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IQ guides
Plain answers on IQ scores, the tests behind them and what the numbers can and cannot tell you. Each guide is written by a psychologist and dated.
What Is the Average IQ? Score, Range and MeaningThe average IQ is 100, and about two in three people score between 85 and 115. Why the average is always 100, how it is measured and what it means.
What Is a Good IQ Score? Ranges, Percentiles and MeaningA good IQ score is anything above 100, the average. What each range means, how percentiles work and what counts as high for gifted programmes or Mensa.
The Highest IQ Ever Recorded, and Why It's DisputedThe highest IQs ever cited, from Marilyn vos Savant's 228 to Terence Tao, and why no modern test can measure a score that high.
What Does IQ Stand For? Meaning and Origin of the TermIQ stands for intelligence quotient. Where the term came from, why it was once a real quotient, and what an IQ score measures today.
Stanford-Binet IQ TestThe Stanford-Binet (SB5) is an individual IQ test for ages 2 to 85+. What it measures, how it is scored, its history and how it compares with the WAIS.
Can You Trust an Online IQ Test? An Honest AnswerSome online IQ tests give a fair estimate; none gives a clinical IQ. How to judge accuracy, why online scores run high and when to see a psychologist.
The Flynn Effect ExplainedWhat is the Flynn effect? A plain guide to the rise in IQ scores over the 20th century, its likely causes, the reverse Flynn effect and why norms matter.