In the twenty-first century, the accessible publishing aim is to make every book available in all formats so that every reader can read with ease and proficiency.
The predominant publishing theory, which stressed economy of scale, tended to make only one format of a given book available.
[7] Then there was the development of audiobooks which originated from the United States Congress in 1931[8] and became popularised by advances in recording and the use of voice actors.
[9][10] Thorndike bought the rights for large print versions of books from publishers and then republished them in a larger and more accessible format for people with reading difficulties.
New technology, such as introduced in the Sony Reader[13] of 2004 and Amazon's Kindle[14] in 2007, provided the ability to alter the size of the font automatically.