Millions of individuals of all ages experience permanent or temporary sensor, motor or cognitive limitations. The "cost" associated with these disabilities includes not only those incurred through medical and support services, but also less tangible costs, such as those due to lost wages and non-productivity. Computer-based Assistive and Rehabilitation Technologies offer tools, devices, systems and services that can be used to correct, enable, maintain, or improve the functional capabilities of individuals with disabilities. As a  relieving measure, Assistive Technologies' scope is twofold: at first, to enable a more independent daily life, whether by providing assisted mobility, communication, or health, and either at home, school or work; and secondly, to offer all the benefits of an inclusive participation in the information society, from the more passive web content accessibility to the full participation in social media and all other Internet services. At the same time, as a corrective measure, the goals of Rehabilitation are to eliminate or at least ameliorate life-limiting disabilities and facilitate community re-entry.  That is, while restoration of function is the most positive outcome of rehabilitation, compensatory strategies are also employed when the natural functions cannot be fully restored.