Alternative and augmentative communication (AAC) Body of Knowledge is one of the results of the project “ICT systems for people with complex communication needs”, financed by the University of Zagreb Development Fund. The AAC Body of Knowledge is available in Croatian only and contains basic information needed for effective development and implementation of AAC systems based on Information and Communication Technology (ICT). It is formed as a multi-disciplinary repository of definitions and references to existing sources of information related to AAC, referencing the following research fields: computer science, speech pathology, education and rehabilitation, psychology and graphic technology. The role of the AAC Body of Knowledge is to establish a reference point for introducing interested stakeholders in the domain of AAC. The AAC Body of Knowledge will be continuously updated with new research findings.