Article 9 the UN Convention defines accessibility as: ‘To enable persons with disabilities to live independently and participate fully in all aspects of life, States Parties shall take appropriate measures to ensure to persons with disabilities access, on an equal basis with others, to the physical environment, to transportation, to information and [..]

within the i-access project accessible information is understood as information provided in formats which allow every learner to access its content ‘on an equal basis with others’ (UN, 2006, p.9) 

extra ways of helping people who find it hard to communicate by speech or writing to communicate more easily. This can include signing and gesture (unaided systems) or books and special computers (aided systems). (International Society of Augmentative and Alternative Communication, Accessed 2 December, 2010 http://www.isaac-online.org/en/aac/what_i [..]

a design approach to products and services, aiming to make them usable for as many people as possible. (2)

(as in digital content, digital devices, digital resources, digital technology) – essentially, another word for computers and computer technology. (Computers store and process information by converting it all to single-figure numbers – digits.) (1)

refers to ‘the gap between those who can benefit from digital technology and those who cannot.’ (http://www.digitaldivide.org/digital-divide/digital-divide-defined/digital-divide-defined/ Accessed 1 February, 2011) (2)

technology in which data is given numerical value. Computer based tools and products. (2)