Tool
In IDEO.org’s Design Toolkit—a resource created to help increase the capacity to design for the global poor—you'll find a set of methods and approaches for learning from extremes
Human-centered design is a practical, repeatable approach to arriving at innovative solutions. Think of the Kit's methods as a step-by-step guide to unleashing your creativity, putting the people you serve at the center of your design process to come up with new answers to difficult problems. This Method in particular introduces the idea of talking to users that sit squarely in the middle of your target audience as well as extreme users to design a solution that works for everyone.