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Technical Committee on Human Factors - Guidelines for real-time communication services
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Principles of DFA

Equitable

  • Avoid exclusion

Flexible

  • Accommodate preferences & abilities

Simple

  • Easy to use

Perceivable information

  • Regardless of abilities and environment

Tolerance for error

  • Minimise effect of mistakes

Low physical effort

  • Minimise fatigue

Size & space for use

  • Regardless of body size, posture & mobility