Both the ICD-11 and the DSM-5 define autism by deficits. Deficits are areas where autistic people are not as good at something as non-autistic people. Autistic people have disagreed with how autism is defined by deficits and not by differences. In Welcome to the Autistic Community, a Simple English book, about being autistic, they refer to differences, rather than symptoms or deficits. Researchers and autistic advocates are working together on creating a way to diagnose that is based on autistic people's experiences of autism and is not deficit based.