• can change in time
• can change temporarily
• just as ability changes over the course of live, it can change during the day due to change of contextual variables and surrounding conditions
• technologies that are now mainstream were once helping with accessibility
  • SMS were back then helping people with hearing disabilities
• DIX-disability interactions

Impairment types:

• permanent
  • wheelchair
• situational
  • noisy environment
• temporary
  • injury recovery