Towards a usability requirements taxonomy for mobile AAC services

Popularity and affordability of mobile computers, especially tablets and smart phones, is considerably rising, providing an access capability for different user groups to various ICT services. Nevertheless, software solutions and hardware devices often seem not suitable enough for some target groups, like people with complex communication needs. In order to gain understanding of the challenges for usability and accessibility requirements gathering for ICT services for aided augmentative and alternative communication (AAC), this paper presents directions towards building usability requirements taxonomy for mobile AAC services. Analysis of influential factors for building proper requirements specification for an AAC service is given. Outlines for new paradigm of so-called augmentative requirements engineering (ARE) are presented, demanding holistic view on service requirements concerning users abilities and needs, service domain and associated intermediary users.