TTS software enables text to be read out loud from a computer screen by a synthetic voice. TTS softtware falls into the category of Assistive Technology, which has a vital role in improvingAccessiblity for a wide range of computer users with special needs - which is now governed by legislation in the UK. The Special Educational Needs and Disability Act (SENDA) of 2001 covers educational websites and obliges their designers "to make reasonable adjustments to ensure that people who are disabled are not put at a substantial disadvantage compared to people who are not disabled." See JISC's website on disability legislation: http://www.jisclegal.ac.uk/disability/accessibility.htm. TTS technology is also used in satellite navigation (satnav) devices that are installed in cars, i.e. to give instructions and read out road and street names. See: Section 4, Module 3.5, headed Speech technologies