What do we measure with IQ tests? Measuring non-autistic people by [the autistic] type of development would often find them failing miserably and appearing to be thoroughly ‘subnormal’ by ‘autistic’ standards. (Donna Williams) Before we can discuss IQ tests and the way they are used with autistic population, we have to define what intelligence is. What is intelligence? And here we have a problem: there is no single definition of intelligence that has been universally accepted