PDA was first described in the 1980s in the UK, by Elizabeth Newson, and is an Autistic Spectrum Disorder related to, but significantly different from, 'standard' autism and Asperger's syndrome, and is increasingly becoming recognised as part of the autism spectrum. Recently there has been the change of language to PDA being a "profile within the autism spectrum". This website offers a host of resources for parents and teachers in relation to PDA syndrome.