Literacy is a concept which almost has taken over and included concepts like reading, writing and inter human social communication in general. However, it has only recently been integrated into the AAC-field of social work, special education and assistive technologies. This paper focusses on some key-questions regarding AAC and literacy, mentioning that the holistic approach of AAC in combination with a general linguistic theory as the one by Charles Peirce and, by that, creates more whole or holistic perspective for thinking and looking for answers on these questions. The social model created by Uri Bronfenbrenner is also very applicable. Even though a holistic approach demands openness on the behalf of the teacher or interventionist as well as of the user her/himself, it is important to remember the need for good methods and methodology, based upon good practical evidence.