I keep seeing the Stanford-Binet test mentioned alongside the WAIS as one of the major IQ tests, but I don’t know much about what makes it different or when it’s used instead of other tests.
What is the Stanford-Binet test? How does it differ from the WAIS or other IQ tests? And when would someone take the Stanford-Binet instead of a different test?
The Stanford-Binet is one of the oldest and most respected IQ tests, first developed in 1905. It measures intelligence across five factors: fluid reasoning, knowledge, quantitative reasoning, visual-spatial processing, and working memory. The main advantage over the WAIS is it has a wider scoring range, making it better for testing very high IQs (gifted individuals) or very low IQs (intellectual disabilities). It’s used for all ages from 2 to 85+. Psychologists choose Stanford-Binet over WAIS when they need to assess extreme scores or test young children.
Stanford-Binet is a comprehensive IQ test that’s been around for over a century. It covers similar cognitive domains as the WAIS but scores from much lower to much higher (IQ 40 to 160+), while WAIS tops out around 145-150. This makes Stanford-Binet preferred for gifted assessments or severe intellectual disability evaluations. It also works for a broader age range starting at age 2. For typical adult assessment, WAIS is more common. For extremes or young children, Stanford-Binet is better.
I think when people ask how the Stanford-Binet differs from the WAIS, they often want to know which is superior. But psychologists might choose Stanford-Binet for young children, for individuals with very low or very high abilities, or when they want more emphasis on verbal reasoning. The WAIS might be preferred for adults, for vocational assessments, or when specific index scores are clinically relevant. Neither is universally better since they illuminate different aspects of cognitive functioning.
What’s interesting about comparing them is what gets lost in the comparison itself. Both tests assume intelligence is something measurable and relatively stable, that standardized conditions produce valid results, and that cognitive ability can be meaningfully quantified. Someone from a different theoretical tradition might argue the real question isn’t “Stanford-Binet or WAIS?" but “why are we reducing human cognition to a number at all?” The choice between tests accepts certain premises about assessment that aren’t universally shared in psychology.