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-fields connected to social work, special education and assistive technologies. This paper focuses 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, creates a 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 with the common target to acquire literacy.