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This standard enables a matching process by providing for common terms to be used for descriptions of user requirements and the relevant characteristics of resources so they can be matched. It does not specify how matches are to be made although examples of systems that make matches are provided in Appendix 1.

The goal is to facilitate the provision of a user experience that matches the needs and preferences of a user by providing a framework for the definition of common terms describing:

  • user needs and preferences and user experiences available from a device and resource


  • a method and format for maintaining and publishing a registry of such common terms.

4.2 Basic Principles for this standard include the following:

  1. It is envisaged that descriptions of requirements may be specified by users or generated by suitable algorithms but, in both cases, users' choices will be given priority in determining the profile of requirements they want to use at any time.
  2. It is understood that some users will have conditional requirements such as "from 8 am to 6 pm I would like white text on black but from 6 pm to 8 am I would like  yellow text on blue".
  3. Some users will specify requirements without which they cannot perceive a resource, essential requirements, needs, and some users will also want to specify preferences in cases where they can manage without the requirement but find it easier if they can have it.
  4. The definition of terms will be achieved in compliance with ISO/IEC N 19788.

4.2 Extending the Standard