Listening what extreme audiences say is an efficient approach to find out what their needs and pain points are.
Source:
https://www.eliseroy.org/blog/2018/1/9/why-companies-should-be-looking-to-people-with-disabilities-to-solve-their-greatest-problems By: IDEO, Elise Roy
Use: Methods of defining Stakeholders' pain points and needs
"When recruiting people to interview, target both the big broad mainstream and those on either extreme of the spectrum. An idea that suits an extreme user will nearly certainly work for the majority of others. And without understanding what people on the far reaches of your solution need, you’ll never arrive at solutions that can work for everyone. More importantly, talking to Extreme users can spark your creativity by exposing you to use cases, hacks, and design opportunities that you’d never have imagined."
Case studies: Google Maps verbal directions; Army Air Corps designed planes around averages
