edit to understanding sections for purpose of controls and common purpose

EA has done a re-wright for the understanding section in 1.3.4 purpose of controls and 1.3.5 common purpose



*Requirement:* We would like to create interoperable symbol sets for those with complex communication needs using Alternative and Augmentative Communication (AAC) systems. AAC systems designed for people who are non-verbal often use symbols with or without text.  End-users tend to only learn one symbol set and cannot easily communicate with other symbol users in a written format or may struggle to understand different symbols used in different applications. Some symbols are subject to copyright and cannot be shared across applications.  However, there are open symbol sets that can be shared and mapped against concepts, generating representative text.  This text can be translated into different languages and used with text to speech output or to present a different set of symbols. If users' symbols are mapped to the same concepts then user agents can load the user understandable symbols and enable access to the web and other applications. 
*User experience:* AAC users, those working with AAC users and others will be able to load symbols that they understand into different applications that have been made by a different provider to allow for online communication and interactions

All the best

Lisa Seeman

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