Alfred Binet was a French psychologist in the late 1800s and early 1900s interested in educating children who did not perform well academically. At the time, legit medical/psychological terms for cognitive disabilities of all kinds included Idiot, Moron, Imbecile, and Feeble-Minded. These labels were applied to wide range of conditions, including those we now understand as intellectual disabilities (in all their many forms), learning disabilities, autism, and others. The standard assessment method was "clinical judgment" by a physician. A great number of European experts and laypersons alike thought such children could not live independently or productively, and should be sequestered from the rest of the public.
In about 1881 French law required mandatory public education of children from 6 to 12 or 13. This flooded schools with children and required many more teachers and schools than before. The previous system had arguably resulted in mostly children with higher privilege or exceptional academic ability going to school. Now all the kids were going, resulting in a large number of children who performed poorly on academic tasks. (Uncomfortable parallels with the US higher education system from the 1990s onward...)
Binet's considerable success as a research psychologist landed him on a commission set up by the French Ministry of Education to decide whether academically low-performing children should be mainstreamed (taught in schools with other children) or sent to a special boarding school that was incidentally attached to a lunatic asylum. Binet was in favor of mainstreaming and individualized education. Further, he and his colleague Théodore Simon (a psychiatrist) advocated objective scientific assessment of intellectual disability (etc.). I think he was ahead of his time on this; half a century (or more) of judgment and decision research shows that "clinical judgment" is robustly beaten by almost any standardized, systematic assessment--even if its validity is low, because humans can't even be consistent, let alone highly accurate; additionally, MDs and others who make such decisions (e.g., politicians, psychologists, CEOs...) tend to get more and more confident in the accuracy of their judgments as their careers progress, though the accuracy itself does not tend to get any higher. Checklists and psychometric scales are almost always more valid.
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(Note: The link here gives some "take an IQ test online" bullshit. Never take an online IQ test; they're extremely low in validity and probably just harvesting data or training an LLM.)
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