Children with Dravet syndrome are a heterogeneous group and their communication and their communication and language- speech development are little researched. This is precisely the area where most of these children due to the specific nature of the syndrome, have complex communication needs and are frequent users of augmentative and alternative communication (AAC). The aim of this work is to describe the communication specifics of boys with Dravet syndrome and to show the effectiveness of the implementation of the AAC- simple communicator Quick Talker FT 23 in a five-month period during which educational and rehabilitation support was provided. The goals of the support were aimed at increasing the number of communication functions, the type and number of communication tools and progress in language understanding. To encouragement, an interactive wall was also used, which served as a visual support in the work. Data on communication and language-speech development were collected through video recordings, which were subsequently analyzed according to the tracking table created for the purposes of this work according to the Pragmatic Profile of Everyday Communication Skills. The results of the research show that after a five-month educational-rehabilitation intervention, the boy shows progress in the type and number of communication functions used, the type and number of communication tools, and language understanding, as well as language production. All the above dispels the myth about the negative impact of augmentative and alternative communication on speech development. In this work, the developmental and communication profile of a boy with Dravet syndrome is presented, the importance of the use of augmentative and alternative communication in encouraging language-speech development in children with complex communication needs is emphasized, which represents a key contribution of the research.