Abstract: Development of AAC theory and practice has contributed to a powerful change of professional consciousness among AAC experts, bringing new requests and requirements to more complex issues among which ethics has been lifted up and mainstreamed. The aim of the present research is to enter the analysis of the core issues of fundamental professional ethical codes in the light of alternative and augmentative communication; to bring contribution into the “normative” integrated interdisciplinary fundamental ethical principles from the perspective of “meeting with unique AAC-user context”. The research methodology is built upon the study of scientific sources, systematized by international electronic data bases and includes an interdisciplinary approach to its collection. Phenomenology and hermeneutics are the basic research methodology to collect and analyze data. A case study of the family context, where deaf parents are upbringing blind child, is taken as a representative part for the discussion. The primary determinant for the intervention strategy was defined as family-centered, based on conceptual principles of Enabling and Empowering Families and Effective help-giving in the early intervention program. Badiou’s theory of ethics and its dimensions of ‘truth’ as a ‘truth’ of the Event were used for the interpretation of ethics of a unique AAC context. The structure of the values forms a meaningful basis for mutual understanding between professionals, family members and professional community in a wider perspective. The success of the AAC implementation as a new discipline is dependent on how all together researchers, professionals and the AAC-users could act ethically developing common understandings, beliefs and values meeting Event in life span longitude.