Concept Mapping is a technique where relationships can be visually represented.It is also possible to use NVDAto evaluate the accessibility of web content with a screen reader and, to allow you to do this, a guide to the basic features of NVDA can be found here. Text and audio instructions for the use of NVDA can be found here.
Screen readers are essential for computer users who are blind.
Screen readers are used to verbalise, or 'speak,' everything on the screen into a computerised voice that is spoken aloud. Screen magnifiers, work like a magnifying glass for the computer by enlarging a portion of the screen which can increase legibility and make it easier to see items on the computer. T-Bar, RapidSet, SSOverlay and ‘My Tint’ for Apple Mac can be userful. Coloured overlays can be useful to assist reading for those with visual stress which is where people can experience unpleasant visual symptoms when reading. Text-to-Speech programs include Balabolka, Orato, Read & Write and ‘Say-it Save-it’ for Apple Macs. These programs are helpful for those who have difficulty seeing or manipulating conventional print materials people who are learning English as a foreign language and people who comprehend better when they hear and see text highlighted simultaneously. Text-to-Speech tools are software designed to speak text out loud. On-screen keyboards are helpful for individuals who are not able to use a standard keyboard due to dexterity or mobility difficulties. On-screen keyboards which provide an image of a standard or modified keyboard on the computer screen. 
A range of assistive technologies explained in the tabs above include: Balabolka Voice Daniel Uk All the programs are open source or free to download. Other assistive technology products are designed to provide additional accessibility to individuals who have physical or cognitive difficulties, impairments, and disabilities.
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