EN
The article outlines the linguistic and logopaedic bases for the therapy of people who lack speech and people who do not speak, with the use of augmentative and alternative communication (AAC). From the methodological perspective, the author refers to the theory of linguistic competence (language, communicative, and cognitive) and tries to adapt it to the needs of the developing linguistics of AAC. The following general parameters have been distinguished for the creation of the theory of AAC linguistics: syntactic competence as the main element of language competence, flexional competence as a prerequisite for proper grammar and sentence structure, lexical competence as a link between language, communicative, and cultural competences, the aims and intentions of the sender, the process of understanding and receiving information by the participants of the communicative act, the effects of the message on the receiver, the influence of the cultural and external conditions on the understanding of message, general knowledge, context, exploring and interpreting the world, conveying the interpretation to others, cultural rules and values. Non-speaking and speechlessness have been chosen as supportive parameters.