Gateway 20 is available in both direct selection and scanning versions. It targets two distinct user populations. One includes children, chronologically between 2-15 years of age, whose receptive skills are at the 24-30 month level. These children may demonstrate severe physical impairments; mild - moderate cognitive limitations; and/or an oral apraxia. The other clinical population includes children whose diagnosis falls within the PDD - Autistic Spectrum. These children are chronologically between 3 - 10 years of age and typically use PECS with an “I want” sentence strip. They can recognize symbols of nouns, verbs and some adjectives/adverbs. Both of these user populations would be communicating in 1-2 word messages. Gateway 20 helps children, who are begining to combine words, to learn to form Subject-Verb-Object expressions. Gateway 20 is designed that children can learn to use adjectives and adverbs, increasing the complexity of their expressive language output.